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本文对鄂伦春语、拉穆特语和鄂温克语元音的发音生理机制、声道形状、声学特征及其系统的历时演变进行分析，得出通古斯元音分类和元音和谐系统的语音学基础是舌根后缩（ＲｅｔｒａｃｔｅｄＴｏｎｇｕｅＲｏｏｔ，简称为ＲＴＲ），确定ＲＴＲ为主要发音生理机制不仅为确定通古斯语言元音和谐系统的和谐特征提供了语音学依据，而且使对通古斯语言元音系统的结构分析变得简单明了：通古斯元音系统仅区分两个音系高度，即高元音和低元音。
In this paper, the phonetic physiological mechanism, vocal shape and acoustic characteristics of Oroqen, Lamuten and Ewenki language are analyzed. The phonological basis of Tungusic vowel classification and vowel harmony system is RetractedTongueRoot (referred to as RTR), to determine the RTR as the main pronunciation of physiological mechanisms not only to determine the Tungusic language vowel harmony system harmonious features provides a phonetic basis, but also to the structure of the Tungusic language vowel system analysis becomes simple Clearly: The Tungus vowel system distinguishes only two phonological heights, namely high vowels and low vowels.