Historical linguists have to identify and classify families of related languages in a genealogical family tree, and to reconstruct the protolanguage.
历史语言学
们通过对各语
中相关语言
别，勾画出族谱图，从而重新构建语
原始语。
,
谱,
谱,,宗谱;;;;;
事;,祖宗传下来;统树，谱树Historical linguists have to identify and classify families of related languages in a genealogical family tree, and to reconstruct the protolanguage.
历史语言学们通过对各语中相关语言别，勾画出族谱图，从而重新构建语原始语。
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