These original ‘proto-languages’—from which all others allegedly have developed—were distinct within themselves, with no previous ancestral language.

这些原始的“前语言”——其他语言从其演化而来——各自截然不同，根本不再有更前面的祖先语言。

youdao

Yet, Proto - Indo - European is believed to be the ancestor of most European languages.

但是印欧语系被认为是大多数欧洲语言的祖先。

youdao

Similar, all Mongolian languages developed from a common Mongolian ancestor language (Proto-Mongolian).

蒙古语族语言同样来自一个原始共同蒙古语。

youdao

Unlike archaeological radiocarbon dating based on the fixed rate of decay of the carbon-14 isotope, there is simply no fixed rate of decay of basic vocabulary, which would allow us to date ancestral proto-languages.

BBC: English language 'originated in Turkey'

But the latest Science paper "and our own observations suggest that it is possible to detect an arrow of time" underlying proto-human languages spoken more than 8, 000 years ago, said Murray Gell-Mann of the Santa Fe Institute in New Mexico, who read the Science paper and supports it.

WSJ: Study Points to a Single, Original Language for All Humans