In prehistoric time people from Africa and Asia migrated to other continents.

在史前时代，人们从亚洲和非洲迁移到其他大洲。

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There was a time when during prehistoric times, people used to communicate in sign languages.

曾经有一段时间，在史前时代，人们用来沟通的手势语言。

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The idea probably dates back to prehistoric time, s when people believed that the gods lived inside trees. Touching a tree was a way of acknowledging the deity and of securing its favor.

此举的源头恐怕要在史前了，那时人们相信神灵居住在树木里，触摸树木是承认神灵并获取其宠爱的一种方式。

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Of course, this has not been the case for ages and it is time we jettisoned our prehistoric baggage.

ECONOMIST: De facto Afghanistan

No phone, no address book, no music: It was as though I'd left the modern world behind at Sunan airport and stepped back in time to a seemingly prehistoric analog era.

NPR: Tweets, Pics Give Real-Time Peek Into North Korea

It begins as a prehistoric adventure (a popular genre at the time), and is related in the solemn, archaic cadences of a fable.

NEWYORKER: The Cosmic Menagerie