Historical linguists have to identify and classify families of related languages in a genealogical family tree, and to reconstruct the protolanguage.
历史语
学家们通过对各语系中相关语
行甄别，勾画出家族谱系图，从而重
构建语系的原始语。
Historical linguists have to identify and classify families of related languages in a genealogical family tree, and to reconstruct the protolanguage.
历史语学家们通过对各语系中相关语行甄别，勾画出家族谱系图，从而重构建语系的原始语。
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