什么叫历时研究？
Diachronic: study of a language is carried through the course of its history.
历时：在语言的历史过程中研究语言。
Diachronic linguistics is the study of a language through the course of its history.
历时语言学是在语言的历史过程中研究语言的。
Diachronic linguistics is the study of a language through the course of its history.
历时语言学是在语言的历史过程中研究语言的。
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