Historical linguists have to identify and classify families of related languages in a genealogical family tree, and to reconstruct the protolanguage.
历史语言学家们通过对各语
中相关语言进
，勾画出家族谱图，从而重新构建语的原始语。
Historical linguists have to identify and classify families of related languages in a genealogical family tree, and to reconstruct the protolanguage.
历史语言学家们通过对各语中相关语言进，勾画出家族谱图，从而重新构建语的原始语。
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