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A rime table or rhyme table () is a Chinese
phonological Phonology is the branch of linguistics that studies how languages or dialects systematically organize their sounds or, for sign languages, their constituent parts of signs. The term can also refer specifically to the sound or sign system of a ...
model, tabulating the
syllable A syllable is a unit of organization for a sequence of speech sounds typically made up of a syllable nucleus (most often a vowel) with optional initial and final margins (typically, consonants). Syllables are often considered the phonological "bu ...
s of the series of
rime dictionaries A rime dictionary, rhyme dictionary, or rime book () is an ancient type of Chinese dictionary that collates Chinese character, characters by tone (linguistics), tone and rhyme, instead of by radical (Chinese character), radical. The most import ...
beginning with the '' Qieyun'' (601) by their
onset Onset may refer to: *Onset (audio), the beginning of a musical note or sound *Onset, Massachusetts Onset is a census-designated place (CDP) in the town of Wareham, Massachusetts, United States. The population was 1,573 at the 2010 census. Geog ...
s,
rhyme A rhyme is a repetition of similar sounds (usually, the exact same phonemes) in the final stressed syllables and any following syllables of two or more words. Most often, this kind of perfect rhyming is consciously used for a musical or aesthetic ...
groups, tones and other properties. The method gave a significantly more precise and systematic account of the sounds of those dictionaries than the previously used analysis, but many of its details remain obscure. The phonological system that is implicit in the rime dictionaries and analysed in the rime tables is known as
Middle Chinese Middle Chinese (formerly known as Ancient Chinese) or the Qieyun system (QYS) is the historical variety of Chinese recorded in the '' Qieyun'', a rime dictionary first published in 601 and followed by several revised and expanded editions. The ...
, and is the traditional starting point for efforts to recover the sounds of early forms of Chinese. Some authors distinguish the two layers as Early and Late Middle Chinese respectively. The earliest rime tables are associated with Chinese
Buddhist Buddhism ( , ), also known as Buddha Dharma and Dharmavinaya (), is an Indian religion or philosophical tradition based on teachings attributed to the Buddha. It originated in northern India as a -movement in the 5th century BCE, and ...
monks, who are believed to have been inspired by the
Sanskrit Sanskrit (; attributively , ; nominally , , ) is a classical language belonging to the Indo-Aryan branch of the Indo-European languages. It arose in South Asia after its predecessor languages had diffused there from the northwest in the late ...
syllable charts in the
Siddham script Siddham may refer to: *Siddhaṃ script (also '), also known in its later evolved form as Siddhamātṛkā, is a medieval Brahmic abugida, derived from the Gupta script and ancestral to the Nāgarī, Assamese, Bengali, Tirhuta, Odia and ...
they used to study the language. The oldest extant rime tables are the 12th-century ''
Yunjing The ''Yunjing'' () is one of the two oldest existing examples of a Chinese rhyme table – a series of charts which arrange Chinese characters in large tables according to their tone and syllable structures to indicate their proper pronunciation ...
'' ("mirror of rhymes") and ''
Qiyin lüe The ''Qiyin lüe'' () is a Chinese rime table, which dates to before 1161. This reference work survived to the present largely because the Song dynasty historian Zheng Qiao (/; ''Cheng Ch'iao''; 1104–1162) included it in his 1161 encyclopedia ...
'' ("summary of the seven sounds"), which are very similar, and believed to derive from a common prototype. Earlier fragmentary documents describing the analysis have been found at
Dunhuang Dunhuang () is a county-level city in Northwestern Gansu Province, Western China. According to the 2010 Chinese census, the city has a population of 186,027, though 2019 estimates put the city's population at about 191,800. Dunhuang was a major ...
, suggesting that the tradition may date back to the late
Tang dynasty The Tang dynasty (, ; zh, t= ), or Tang Empire, was an Dynasties in Chinese history, imperial dynasty of China that ruled from 618 to 907 AD, with an Zhou dynasty (690–705), interregnum between 690 and 705. It was preceded by the Sui dyn ...
. Some scholars use the French spelling "rime", as used by the Swedish linguist
Bernhard Karlgren Klas Bernhard Johannes Karlgren (; 15 October 1889 – 20 October 1978) was a Swedish sinologist and linguist who pioneered the study of Chinese historical phonology using modern comparative methods. In the early 20th century, Karlgren conducte ...
, for the categories described in these works, to distinguish them from the concept of poetic rhyme.


History

The '' Qieyun'', produced by Lu Fayan () in 601, was a
rime dictionary A rime dictionary, rhyme dictionary, or rime book () is an ancient type of Chinese dictionary that collates Chinese character, characters by tone (linguistics), tone and rhyme, instead of by radical (Chinese character), radical. The most import ...
, serving as a guide to the recitation of literary texts and an aid in the composition of verse. It quickly became popular during the
Tang dynasty The Tang dynasty (, ; zh, t= ), or Tang Empire, was an Dynasties in Chinese history, imperial dynasty of China that ruled from 618 to 907 AD, with an Zhou dynasty (690–705), interregnum between 690 and 705. It was preceded by the Sui dyn ...
, leading to a series of revised and expanded editions, the most important of which was the '' Guangyun'' (1008). In these dictionaries, characters were grouped first by the
four tones This article summarizes the phonology (the sound system, or in more general terms, the pronunciation) of Standard Chinese (Standard Mandarin). Standard Chinese phonology is based on the Beijing dialect of Mandarin. Actual production varies wid ...
, and then into rhyme groups. Each rhyme group was subdivided into groups of homophonous characters, with the pronunciation of each given by a ''
fanqie ''Fanqie'' ( zh, t= 反切, p=fǎnqiè) is a method in traditional Chinese lexicography to indicate the pronunciation of a monosyllabic character by using two other characters, one with the same initial consonant as the desired syllable and one ...
'' formula, a pair of familiar characters indicating the sounds of the initial and final parts of a syllable respectively. The dictionaries typically used several characters for each initial or final. The fanqie method of indicating pronunciation made the dictionaries awkward to use. The () was a more sophisticated analysis of the ''Qieyun'' pronunciations, initially developed by Chinese Buddhist monks who were studying Indian linguistics. A tantalizing glimpse of this tradition is offered by fragments from
Dunhuang Dunhuang () is a county-level city in Northwestern Gansu Province, Western China. According to the 2010 Chinese census, the city has a population of 186,027, though 2019 estimates put the city's population at about 191,800. Dunhuang was a major ...
. A fragment held by the
British Library The British Library is the national library of the United Kingdom and is one of the largest libraries in the world. It is estimated to contain between 170 and 200 million items from many countries. As a legal deposit library, the British ...
(Or.8210/S.512) simply lists 30 initial consonants. Another document includes three fragments attributed to a monk called Shǒuwēn (), who may have lived as early as the 9th century. These fragments do not contain tables, but describe the phonological analysis that underlies them. The oldest known rhyme tables are a version of the ''
Yunjing The ''Yunjing'' () is one of the two oldest existing examples of a Chinese rhyme table – a series of charts which arrange Chinese characters in large tables according to their tone and syllable structures to indicate their proper pronunciation ...
'' published with prefaces dated 1161 and 1203, and the ''
Qiyin lüe The ''Qiyin lüe'' () is a Chinese rime table, which dates to before 1161. This reference work survived to the present largely because the Song dynasty historian Zheng Qiao (/; ''Cheng Ch'iao''; 1104–1162) included it in his 1161 encyclopedia ...
'', which was included in the 1161 encyclopedia '' Tongzhi''. The two are very similar, and are believed to be derived from a single version pre-dating the
Song dynasty The Song dynasty (; ; 960–1279) was an imperial dynasty of China that began in 960 and lasted until 1279. The dynasty was founded by Emperor Taizu of Song following his usurpation of the throne of the Later Zhou. The Song conquered the rest ...
. The tables were accompanied by a body of teachings known as (), including rules for placing fanqie spellings that did not conform to the system within the tables. Later rhyme tables were more elaborate. The (四聲等子) was probably created during the Northern Song, and explicitly introduced broad rhyme classes ( 攝), which were previously implicit in the ordering of the tables. The preface of the (切韻指掌圖) is dated 1203, in the Southern Song. In this work the tables are restructured with separate columns for each of the 36 initials. The (經史正音切韻指南), produced by Liú Jiàn (劉鑑) in 1336, was the basis for one of the two sets of rime tables at the front of the
Kangxi dictionary The ''Kangxi Dictionary'' ( (Compendium of standard characters from the Kangxi period), published in 1716, was the most authoritative dictionary of Chinese characters from the 18th century through the early 20th. The Kangxi Emperor of the Qing ...
. The ''Yunjing'' was lost in China for several centuries. The ''Qieyun zhizhangtu'', incorrectly attributed to the 11th century scholar
Sima Guang Sima Guang (17 November 1019 – 11 October 1086), courtesy name Junshi, was a Chinese historian, politician, and writer. He was a high-ranking Song dynasty scholar-official who authored the monumental history book ''Zizhi Tongjian''. Sima was ...
, was believed to be the oldest of the rime tables, and was used in the earliest reconstruction efforts. However, in the 1880s several versions of the ''Yunjing'' were discovered in Japan. Comparison with the ''Qiyin lüe'' showed that they were based on a common model, of which the other rime tables were later refinements. All recent reconstruction work has been based on the ''Yunjing''. The (覆宋永禄) edition of 1564 is considered the most reliable, and is the basis of all reproductions in circulation.


Structure

In the medieval rime dictionaries, characters were organized into rhyme groups (), with 193 groups in the ''Qieyun'', growing to 206 in the ''Guangyun''. The order of the rhyme groups within each tone implies a correspondence between rhyme groups across the
four tones This article summarizes the phonology (the sound system, or in more general terms, the pronunciation) of Standard Chinese (Standard Mandarin). Standard Chinese phonology is based on the Beijing dialect of Mandarin. Actual production varies wid ...
. Thus for each rhyme group with an -m, -n or -ng coda in the level tone there are typically corresponding rhyme groups with the same coda in the rising and departing tones, and a corresponding rhyme group in the entering tone with a -p, -t or -k coda respectively. In contrast, syllables with vocalic codas typically had corresponding rhyme groups only in the level, rising and departing tones. There were also four departing tone rhyme groups with -j codas that had no counterparts in the other tones. The rime tables were solely concerned with the pronunciation of syllables of these rime dictionaries, and do not contain dictionary-like material such as definitions. Similarly, where a group of characters are recorded as
homophone A homophone () is a word that is pronounced the same (to varying extent) as another word but differs in meaning. A ''homophone'' may also differ in spelling. The two words may be spelled the same, for example ''rose'' (flower) and ''rose'' (p ...
s in the rime dictionaries, typically only one will occur in a rime table. A rime table book presents these distinct syllables in a number of tabular charts, each devoted to one or more sets of parallel rhyme groups across the tones. The preface to ''Qieyun'' indicates that it represented a compromise between northern and southern reading pronunciations from the late
Northern and Southern dynasties The Northern and Southern dynasties () was a period of political division in the history of China that lasted from 420 to 589, following the tumultuous era of the Sixteen Kingdoms and the Eastern Jin dynasty. It is sometimes considered as ...
period. Most linguists now believe that no single dialect contained all the distinctions it recorded, but that each distinction did occur somewhere. The rime tables were compiled centuries later in the time of a new standard, and many of the distinctions in the ''Qieyun'' would have been meaningless to the compilers.
Edwin Pulleyblank Edwin George "Ted" Pulleyblank (August 7, 1922 – April 13, 2013) was a Canadian sinologist and professor at the University of British Columbia. He was known for his studies of the historical phonology of Chinese. Life and career Edwin G. ...
has argued that the tables contain enough evidence to reconstruct the speech of that later period. He calls this language Late Middle Chinese (LMC) in contrast to the Early Middle Chinese of the ''Qieyun'', and argues that it was the standard speech of the imperial capital
Chang'an Chang'an (; ) is the traditional name of Xi'an. The site had been settled since Neolithic times, during which the Yangshao culture was established in Banpo, in the city's suburbs. Furthermore, in the northern vicinity of modern Xi'an, Qin Shi ...
in the late
Tang dynasty The Tang dynasty (, ; zh, t= ), or Tang Empire, was an Dynasties in Chinese history, imperial dynasty of China that ruled from 618 to 907 AD, with an Zhou dynasty (690–705), interregnum between 690 and 705. It was preceded by the Sui dyn ...
. His reconstruction accounts for most of the distinctions in modern varieties of Chinese (except
Min Min or MIN may refer to: Places * Fujian, also called Mǐn, a province of China ** Min Kingdom (909–945), a state in Fujian * Min County, a county of Dingxi, Gansu province, China * Min River (Fujian) * Min River (Sichuan) * Mineola (Am ...
), as well as layers of Chinese loanwords, such as the Kan-on layer of
Sino-Japanese vocabulary Sino-Japanese vocabulary, also known as refers to Japanese vocabulary that had originated in Chinese or were created from elements borrowed from Chinese. Some grammatical structures and sentence patterns can also be identified as Sino-Japanese. Si ...
.


Tables

Each chart of the ''Yunjing'' is labelled as either "open" ( ) or "closed" (). The corresponding terms in the ''Qiyin lüe'' are "heavy" () and "light" (). The open/closed distinction is interpreted to indicate the absence or presence of lip rounding (often transcribed as -w- or -u-). Some ''Guangyun'' rhyme groups include syllables of both kinds, and thus span two charts, while others are purely "open" or "closed", and thus fit within one chart. Charts are grouped together in broad rhyme classes (), each characterized as either "inner" () or "outer" (), thought to be related to vowel heights, contrasting
close vowel A close vowel, also known as a high vowel (in U.S. terminology), is any in a class of vowel sounds used in many spoken languages. The defining characteristic of a close vowel is that the tongue is positioned as close as possible to the roof of th ...
s and
open vowel An open vowel is a vowel sound in which the tongue is positioned as far as possible from the roof of the mouth. Open vowels are sometimes also called low vowels (in U.S. terminology ) in reference to the low position of the tongue. In the cont ...
s respectively., pp. 31–32; , p. 42. For example, the first of the 43 charts of the ''Yùnjìng'' is shown below (the Arabic numerals are modern annotations): The five big characters on the right-hand side read (內轉第一開). In the ''Yùnjìng'', each chart is called a (lit. 'turn'). The characters indicate that the chart is the first (第一) one in the book, and that the syllables of this chart are "inner" (內) and "open" (開). The columns of each table classify syllables according to their initial consonant ( 聲母 lit. 'sound mother'), with syllables beginning with a
vowel A vowel is a syllabic speech sound pronounced without any stricture in the vocal tract. Vowels are one of the two principal classes of speech sounds, the other being the consonant. Vowels vary in quality, in loudness and also in quantity (leng ...
considered to have a "zero initial". Initials are classified according to *
place of articulation In articulatory phonetics, the place of articulation (also point of articulation) of a consonant is a location along the vocal tract where its production occurs. It is a point where a constriction is made between an active and a passive articula ...
: labials ( 脣 'lip'), alveolars ( 舌 'tongue'),
velars Velars are consonants articulated with the back part of the tongue (the dorsum) against the soft palate, the back part of the roof of the mouth (known also as the velum). Since the velar region of the roof of the mouth is relatively extensive an ...
( 牙 'back tooth'),
affricates An affricate is a consonant that begins as a stop and releases as a fricative, generally with the same place of articulation (most often coronal). It is often difficult to decide if a stop and fricative form a single phoneme or a consonant pair ...
and
sibilants Sibilants are fricative consonants of higher amplitude and pitch, made by directing a stream of air with the tongue towards the teeth. Examples of sibilants are the consonants at the beginning of the English words ''sip'', ''zip'', ''ship'', and ...
( 齒 "front tooth"), and laryngeals ( 喉 'throat'). The values of the last category remain controversial. *
manner of articulation In articulatory phonetics, the manner of articulation is the configuration and interaction of the articulators (speech organs such as the tongue, lips, and palate) when making a speech sound. One parameter of manner is ''stricture,'' that is, h ...
: voiceless ( 清 'clear'), voiceless aspirated ( 次清 'secondary clear'), voiced ( 濁 'muddy') or nasal or
liquid A liquid is a nearly incompressible fluid that conforms to the shape of its container but retains a (nearly) constant volume independent of pressure. As such, it is one of the four fundamental states of matter (the others being solid, gas, a ...
( 清濁 'clear muddy'). The order of the places and manners roughly match that of
Sanskrit Sanskrit (; attributively , ; nominally , , ) is a classical language belonging to the Indo-Aryan branch of the Indo-European languages. It arose in South Asia after its predecessor languages had diffused there from the northwest in the late ...
, providing further evidence of inspiration from Indian phonology. Each table had 16 rows, with a group of four rows for each of the four tones of the '' Qieyun''. The above chart covers four parallel ''Guangyun'' rhyme groups, the level-toned 東 , the rising-toned 董 , the departing-toned 送 , and the entering-toned 屋 (which in Middle Chinese ended in -k, the entering tone counterpart of -ng). Within each tone group are four rows known as (等 'class', 'grade' or 'group'), which
Bernhard Karlgren Klas Bernhard Johannes Karlgren (; 15 October 1889 – 20 October 1978) was a Swedish sinologist and linguist who pioneered the study of Chinese historical phonology using modern comparative methods. In the early 20th century, Karlgren conducte ...
translated as "divisions" while other linguists prefer "grades". They are usually denoted by Roman numerals I to IV. Their meaning remains the most controversial aspect of rime table phonology, but is believed to indicate palatalization (transcribed as the presence or absence of -j- or -i-),
retroflex A retroflex (Help:IPA/English, /ˈɹɛtʃɹoːflɛks/), apico-domal (Help:IPA/English, /əpɪkoːˈdɔmɪnəl/), or cacuminal () consonant is a coronal consonant where the tongue has a flat, concave, or even curled shape, and is articulated betw ...
features,
phonation The term phonation has slightly different meanings depending on the subfield of phonetics. Among some phoneticians, ''phonation'' is the process by which the vocal folds produce certain sounds through quasi-periodic vibration. This is the defini ...
, vowel quality (high vs. low or front vs. back) or some combination of these. Other scholars view them not as phonetic categories but formal devices exploiting distributional patterns in the ''Qieyun'' to achieve a compact presentation. The symbol indicates that that particular syllable does not occur.
Bernard Karlgren Klas Bernhard Johannes Karlgren (; 15 October 1889 – 20 October 1978) was a Swedish sinologist and linguist who pioneered the study of Chinese historical phonology using modern comparative methods. In the early 20th century, Karlgren conduct ...
noticed that classes of finals from the rime dictionaries were placed in different rows of the rime tables. As three classes of final occurred in the first, second and fourth rows respectively, he named them finals of divisions I, II and IV. The remaining finals he called "division-III finals" because they occurred in the third row of the tables. Some of these (the "pure" division-III finals) occurred only in that row, while others (the "mixed" finals) could also occur in the second or fourth rows with some initials. Later workers noted that in the so-called rhyme groups, , , , , , , and , a consistent distinction within each rhyme group in the rime books is reflected in the rime tables by dividing the rhyme group between rows 2 and 4, often in adjacent tables. Li Rong, in a systematic comparison of the rhyme tables with a recently discovered early edition of the , identified seven classes of finals. The table below lists the combinations of initial and final classes that occur in the , with the row of the rime tables in which each combination was placed: The mixed and finals, though designated as division-III finals, are spread across rows 2 and 4 as well as row 3 of the tables. To handle these cases, a distinction is made between the row that the homophone class is placed in and the "division" of its final. This article distinguishes rows by
Arabic numeral Arabic numerals are the ten numerical digits: , , , , , , , , and . They are the most commonly used symbols to write decimal numbers. They are also used for writing numbers in other systems such as octal, and for writing identifiers such as ...
s 1 2 3 4 and divisions by
Roman numeral Roman numerals are a numeral system that originated in ancient Rome and remained the usual way of writing numbers throughout Europe well into the Late Middle Ages. Numbers are written with combinations of letters from the Latin alphabet, ea ...
s I II III IV. In addition, division-II and division-IV finals occur only in "outer" . This distribution is the foundation of the compact tabular presentation of rime dictionary syllables. For example, the dental and retroflex stop initials are combined in a single group in a rime table, with the rows distinguishing the different initials, and the three groups of sibilant initials are similarly combined. In a similar fashion different finals may occupy different rows of the same chart. The rhyme groups (here illustrated in the level tone, except where a group occurs only in the departing tone) are distributed across the 43 charts of the and as follows: In some cases, the already reflected the open/closed distinction with separate rhyme groups, while in others they were included in the same group.


Thirty-six initials

The earliest documentary records of the rime table tradition, the Dunhuang fragments, contain lists of 30 initials, each named after an exemplary character. This was later expanded to a standard set of 36 in the preface of the ''Yunjing'', the major addition being a series of
labiodental In phonetics, labiodentals are consonants articulated with the lower lip and the upper teeth. Labiodental consonants in the IPA The labiodental consonants identified by the International Phonetic Alphabet are: The IPA chart shades out ''labio ...
fricatives split from the labial series: Tables of the ''Yunjing'' have only 23 columns, with one group of columns each for labials, coronals and sibilants, with the different types placed in different rows of the tables. Some later tables such as the ''Qieyun zhizhangtu'' have 36 columns, one for each of the 36 initials. The 36 initials were so influential that it was not until 1842 that it was discovered (by Chen Li) that the initials of the ''Qieyun'' were slightly different. There is some variation in the transcription of the initials and . The table above uses and . Other conventions are vs nothing, vs , and mid dot vs . These conventions carry over to other scripts of the Sinological tradition, such as ʼPhags-pa and Jurchen.


Notes


References

Footnotes Works cited * * See als
List of Corrigenda
* * * * * * * *


External links

* Fragments prefiguring the rime tables, found at
Mogao Caves The Mogao Caves, also known as the Thousand Buddha Grottoes or Caves of the Thousand Buddhas, form a system of 500 temples southeast of the center of Dunhuang, an oasis located at a religious and cultural crossroads on the Silk Road, in Gansu p ...
,
Dunhuang Dunhuang () is a county-level city in Northwestern Gansu Province, Western China. According to the 2010 Chinese census, the city has a population of 186,027, though 2019 estimates put the city's population at about 191,800. Dunhuang was a major ...
: ** : 《歸三十字母例》 ''"Guī sānshí zìmǔ lì"'' (30 initials), a fragment collected by
Aurel Stein Sir Marc Aurel Stein, ( hu, Stein Márk Aurél; 26 November 1862 – 26 October 1943) was a Hungarian-born British archaeologist, primarily known for his explorations and archaeological discoveries in Central Asia. He was also a professor at ...
. ** {{IDP, Pelliot chinois 2012, Bibliothèque nationale de France
BNF link
: a scroll containing the
Shouwen Shǒuwēn () was a 9th-century Buddhist Chinese monk credited with the invention of the analysis of Middle Chinese as having 36 initials, later ubiquitously used by the rime tables A rime table or rhyme table () is a Chinese phonological model ...
fragments (on the reverse side from the drawing) collected by
Paul Pelliot Paul Eugène Pelliot (28 May 187826 October 1945) was a French Sinologist and Orientalist best known for his explorations of Central Asia and his discovery of many important Chinese texts such as the Dunhuang manuscripts. Early life and caree ...
. * Scanned books at the
Internet Archive The Internet Archive is an American digital library with the stated mission of "universal access to all knowledge". It provides free public access to collections of digitized materials, including websites, software applications/games, music, ...
: *
''Yunjing''
*
parts 34–36
an
37–38
of the '' Tongzhi'' encyclopedia – the ''Qiyin lüe'' comprises parts 36 and 37 *
''Qieyun zhizhangtu''
*
Preface
of the ''
Kangxi dictionary The ''Kangxi Dictionary'' ( (Compendium of standard characters from the Kangxi period), published in 1716, was the most authoritative dictionary of Chinese characters from the 18th century through the early 20th. The Kangxi Emperor of the Qing ...
'', including rime tables * Scanned books at the
Chinese Text Project The Chinese Text Project (CTP; ) is a digital library project that assembles collections of early Chinese texts. The name of the project in Chinese literally means "The Chinese Philosophical Book Digitization Project", showing its focus on books ...
: *
''Yunjing''
*
''Qieyun zhizhangtu''
*
''Qieyun zhinan''
*
''Kangxi dictionary''
(Tongwen Shuju edition), with rime tables in the preface
''Qieyun zhizhangtu''
at the
National Library of Australia The National Library of Australia (NLA), formerly the Commonwealth National Library and Commonwealth Parliament Library, is the largest reference library in Australia, responsible under the terms of the ''National Library Act 1960'' for "mainta ...

''Sisheng dengzi''
scan at the
Chinese University of Hong Kong The Chinese University of Hong Kong (CUHK) is a public research university in Ma Liu Shui, Hong Kong, formally established in 1963 by a charter granted by the Legislative Council of Hong Kong. It is the territory's second-oldest university and ...

Rhyme Tables
Dylan W.H. Sung Chinese dictionaries Rhyme Middle Chinese Traditional Chinese phonology