在人类历史的大部分时间里，我们都是黑皮肤。

For most of the human history, we all had dark skin.

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在人类历史的大部分时间里，盐的这种能力使得自身很有价值。

For much of humans history, this ability has made salt valuable.

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使用简单的石器工具去切肉与骨头，在人类历史中标志着一个至关重要的时刻。

The use of simple stone tools to remove meat and marrow marks a crucial moment in the human story.

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And in many ways, we can understand human intellectual history just based on this idea: ? should we accept human nature?

在很多方面，我们能理解人类智力发展历史,仅仅基于这个观点：,应不应该接受人类本性？

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But through the course of human history, nobody has ever encountered another group of humans that did not have a language.

但在人类历史的进程中,还没有人曾经遇到过,没有语言的人类族群

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Now there are challenges to a plant based diet which made eating meat important to humans in human history.

在人类历史上,以素食为主的饮食方式面临各种挑战,使得进食肉类变得重要

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