English is belonged to the Indo-European Family.
英语属于印欧语系。
English and French are of the Indo-European family.
英语和法语都属于印欧语系。
Long enough that there was an Indo-European word for cow gwou.
这段时间很长，以至于在印欧语系里就有个对应于cow的单词gwou。
In fact our word lean evolved from the same Indo-European root.
事实上，我们语言中的lean也是来源同样的印欧语系。
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。
Experts say the people in that area spoke a language called Proto-Indo-European.
专家说那个地区的人使用一种叫做古印欧语的语言。
Experts say the people in that area spoke a language called Proto-Indo-European.
专家说那个地区的人使用一种叫做古印欧语的语言。
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