n.[语]原始母语

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系中相关语言进行甄别，勾画出家族谱系图，从而重新构建语系的原始语。

"Proto" is a combining form in a word like "protolanguage" that refers to the hypothetical ancestor of another language or group of languages. “Proto”是“protolanguage”这样的词的构词成分，后者是指另一种语言或另一组语言的假设祖先。

of or relating to the relationship between or among languages that are descendants of a protolanguage 语言史的，属于、关于一个原始母语各分支之间关系的