Historical linguists have to identify and classify families of related languages in a genealogical family tree, and to reconstruct the protolanguage.
历史语
们通过对各语系中相关语进行甄别，勾
出族
系图，从而重新构建语系的原始语。
,系图,族,族图Historical linguists have to identify and classify families of related languages in a genealogical family tree, and to reconstruct the protolanguage.
历史语们通过对各语系中相关语进行甄别，勾出族系图，从而重新构建语系的原始语。
A family tree is a diagram with branches, showing how the members of a family are descended and related.
说明族成员血缘承袭关系的明细分支图。
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