一曾运乾的喻四归定说,在汉语音韵学界的影响很深,至今仍有很多人信奉其说。要从根本上将它推翻,显然需要引用下面的假设。假设1,具有相同语音条件的一组字,在同一历史阶段只能有相同的音变结果。如有例外,必另有语音条件在起作用。 One of the four Yu-Si had been shipped to say that the impact of the phonological scholarship in China is very deep, there are still many people believe it. To overthrow it fundamentally, it is clear that the following assumptions need to be quoted. Hypothesis 1, a group of words with the same speech conditions, in the same historical stage can only have the same phonological results. With some exceptions, there must be another voice condition at work.