The Indo-European root that likely gave us our word number was nem.

number这个词的印欧语词根可能是nem。

youdao

No one knows what made the Germanic language branch off from the Indo-European family.

无人知晓什么原因导致了日耳曼语从印欧语系中脱离。

youdao

Around 300 BC there was a language now called the Indo-European language in what is now southeast Russia.

大约在公元前300年，在现今的俄罗斯东南部有一种被称之为印欧语系的语言存在。

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'

To do so he looked at three well-studied parts of the linguistic family tree: the Bantu languages of Africa, the Indo-European group from Eurasia and the Austronesians of the Pacific.

ECONOMIST: Languages and species evolve in surprisingly similar ways

They suspect that it was responsible for the sudden spread of the Indo-European group of humanity about 4, 000 years ago, and also for the more recent spread of the Tutsis in Africa, whose ancestors independently evolved a tolerant version of the gene.

ECONOMIST: Human evolution