hóng yīn
意思解释：（Hong Yin）音韵学术语。发音时口腔共鸣空隙较大的音。宋元等韵学家分韵母为开口、合口两类，每类又分一、二、三、四四等，一、二等都没有介音，发音时口腔共鸣空隙较大，故称洪音。自明清等韵学家改开、合各四等为开、齐、合、撮四呼以后，也有人称开口呼为开口洪音，齐齿呼为开口细音，合口呼为合口洪音，撮口呼为合口细音。
与“细音”对称。主要元音舌位后而低、发音开口度较大的韵母。唐、宋、元等韵学家以介音[i]的有无及主要元音的舌位分韵类为四等。明桑绍良《青郊杂著》据当时读音变四等为二等，明袁子让《字学元元》“读上下等法辩”云…
With thin tone symmetrical. Main vowel tongue hind and mouth of low, pronunciation spends bigger simple or compound vowel. The Tang Dynasty, the Song Dynasty, yuan wait for charm to learn the home in order to in certain compound vowels [of I] have without reach main vocalic tongue cent charm kind for 4 etc. Fine of bright mulberry carry on green outskirt is miscellaneous according to pronunciation changes at that time 4 etc for second-class, bright Yuan Zi lets the word learns yuan yuan read the doctrine debate such as fluctuation the cloud...
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