chǐ yǎn
意思解释：（Wastefuling ）指钟口的大与小。 犹言增多与减少。
清人江永等审音所用的术语。指韵腹元音发音时口腔的开合。江永以此为标准，认为上古语音系统中宵与幽、元与真、侵与凡各部两两相对，前者“口开而声大”，后者“口弇而声细”，应该分成六个部类。…
The term that the careful sound place such as clear person Jiang Yong uses. The buccal when showing vowel of the essential vowel in a compound vowel articulates leaves close. Jiang Yong is a standard with this, think antediluvian speech system is medium night and deep and remote, yuan with true, invade as departmental as every two two-phase are right, former the mouth leaves and reputation is big , latter buccal and tone is thin , should divide into 6 division. ...
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