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*oN类韵母是指主元音为唇化的o,以鼻音-m/n/充当韵尾的韵母形式。汉语史上,*om类韵母形式存在于早期汉语,它发展为《切韵》覃韵。按照音系结构的规律性,跟*om平行的形式还有*on和*o。前者发展成为桓韵,是从一个平面演变为另一个平面;后者分化为冬韵与唐合,是*o裂解后呈现出来的结构形式,历史上曾经二韵一体。从语音发展史来看,*om十分保守,*on趋向于裂化式创新,*o则是保守和创新两种色彩相互交织。一等阳声韵的发展态势和方向受到了韵尾的强烈影响,其演变机制跟鼻音的发音部位及发音过程中舌头对口腔的分割度密切相关。
* oN vowel refers to the main vowel is lip-o, nasal-m / n / vowel ending vowel form. In the history of Chinese, * om’s vowel forms exist in early Chinese, which evolved into “Qie Yun” Qin Yun. According to the regularity of the phonological structure, * on and * o are parallel to * om. The former developed into Huan Yun, which evolved from one plane to another. The latter differentiated into winter rhyme and Tang He. It was a structural form that emerged after the * o crack. From the voice of the history of the development, * om is very conservative, * on tends to crack innovation, * o is a conservative and innovative two colors intertwined. The development tendency and direction of first-class rhyme rhyme are strongly influenced by the end of rhyme. The evolving mechanism is closely related to the division of the oral cavity in the pronunciation part of the nasal tone and the tongue.