音韵学 yīnyùnxué phonology Origin Definitions Defs Strokes Stroke Words Sentences Sents 1 sentence 在学习中国古代音韵学时，需要区分平、上、去、入。 zài xuéxí Zhōngguó gǔdài yīnyùnxué shí, xūyào qūfēn píng, shǎng, qù, rù. When studying ancient Chinese phonology, it is necessary to distinguish between the level, rising, departing, and entering tones. Source: Dong Chinese Dictionary