The scholars referred to that source language as Proto-Indo-European. Proto-Indo-European is a reconstructed language.
学者们把这种源语言称为原始印欧语。原始印欧语是一种重建的语言。
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Proto-Indo-European is a reconstructed language, meaning, it is what linguists concluded a parent language of Sanskrit, Latin and Greek would have to be like.
Perhaps the most striking sign of mobility is the fact that by the third millennium B.C., most pastoralists in this huge region spoke related languages ancestral to the modern Indo-European languages.