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陕西关中方言中存在双唇音声母在o、u韵前唇齿化的现象,近八十年来这种现象从地域分布到类型都有较大扩展。从发生顺序来看,送气音ph首先唇齿化,鼻音m最晚唇齿化。文章联系学界关于汉语史上重唇音变轻唇音的考察成果,讨论了双唇音声母唇齿化的语音机制,附带讨论了汉语史上重唇变轻唇演变规律中的两个变例给我们的启示。
In Shaanxi Guanzhong dialect, there is a phenomenon that the lip consonants have lip-tending before o and u rhyme, and this phenomenon has been greatly expanded from the geographical distribution to the type in recent eight decades. Order from the point of view, the first air ph sound phin, nasal m nasal lip teeth. In this paper, the author consults the academic circles about the research results of heavy lip lip in the history of Chinese, and discussed the phonetic mechanism of the lip lip of the labial lip, accompanying with the enlightenment of two variations in the evolution of the lip in the Chinese history.