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。

youdao

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.

原始印欧语是一门经过重构得出的语言，也就是说，这就是语言学家总结出梵语、拉丁语和希腊语的母系语言的样子。

youdao

We speak a decimal language because an ancestral tongue, proto-Indo-European, was decimally based.

我们说的是十进制的语言，这是因为我们的始祖语言——原始印欧语——是基于十进制的。

youdao

He argues that the Indo-European proto-language diversified after the invention of the wheel, about 5, 000 years ago.

BBC: English language 'originated in Turkey'