Based on the synchronic description, this article highlighted the diachronic studies and analysis.

全文以共时描写为基础，突出历时考察和分析。

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Then , it goes further to analyze reasons leading to these divergences. There are three reasons: Much emphasis was put on static and synchronic analysis instead of dynamic and diachronic examination;

第三章分析产生分歧的原因，认为原因有三：注重静态共时分析，忽视动态历时考察；

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