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本文通过非线性音变微观过程的刻画，建立熵变和特征投射音变模型。这两类模型力图揭示语音演变的复杂性和随机性，并对这些现象作出解释，在语音面貌极不相同而又有语音对应关系的词之间搭起识别同源关系的桥梁。
In this paper, entropy change and feature projection sounding model are established through the characterization of nonlinear sounding microscopic process. These two models seek to reveal the complexity and randomness of the evolution of speech and to explain these phenomena and bridge the recognition of homology between words with very different phonetic and phonetic correspondences.