“内转”和“外转”是等韵学上的一对概念,由于最早分内外转的韵图《韵镜》,也没对内外转的含义加以说明,于是后来的治等韵者,便有了各种解说。大致有以下两种意见:一种解释是说,“转”是指韵图中有没有真正二等韵,有者叫外转,无者叫内转,这是对“内外转”传统的解说,基本继承了《四声等子》和《切韵指掌图》中“辨内外转例”的观点;另一种意见则认为内外转与唇之开合、舌之伸缩、主要元音之侈等发音方面的因素有关,被视为对“内外转”的异解。因缺乏有力的论据,内外转究竟指的是什么?古之韵图作者是根据什么分韵图为内外转的?音韵学界还没有能使人信服的定论,一般人也只好拘守传统,“内外转”也就成了音韵学上 “Internal transfer” and “external transfer” are equivalent concepts such as rhyme. Since the first rhyme map of internal and external transfer of Yun Yun was not elaborated on the meanings of internal and external referrals, Have a variety of explanations. Generally speaking, there are two kinds of opinions: One explanation is that “turn” means that there is no real second-class rhyme in the rhyme chart. Some are called external turnovers, while others are called turnovers. This is the traditional explanation of “internal and external turnovers” , Basically inherit the viewpoints of “distinguishing between inside and outside” in the “four tones and other sub-figures” and “cut the palm of your hand”; the other opinion is that the opening and closing of the inside and outside the switch and the lip, the expansion and contraction of the tongue, the main vowel Extravagant pronunciation and other factors related to the “internal and external transfer” misunderstandings. Because of the lack of strong arguments, both inside and outside the transfer refers to what? The ancient rhyme map is based on what the rhyme map for the internal and external transfer? Phonological community has not convinced the conclusion, most people have to keep the traditional, “inside and outside Turn ”has become phonetics