他认为，自然选择对于那些曾经是利他主义者的人是有利的，因为我们的祖先生活在小而密集的群体中，人们的利他主义可以指望得到相互间的利益互惠。

He argues that natural selection favored humans who were altruistic because in the small, close-knit groups in which our ancestors lived, altruists could expect reciprocity.

youdao

为了您开始运动时，一定要先了解相互的差异和非互惠的联系。

In order to begin your campaign, you must first understand the difference between reciprocal and non-reciprocal links.

youdao

整个建筑充分体现了城市和乡村相互依存、互惠共生的关系，强调人类、自然与科技的完美平衡。

The building shows the interdependent relationship between city and countryside and emphasizes a perfect equilibrium among human, nature and high-tech.

youdao

A sense of reciprocity is establishedbetween the tow truck and the person who helps the tow truck out of being stuck -a fine sense of reciprocity, so the expectation is that there will be a moral.

在托运车和把托运车从困境中解救出来的人之间,建立起了一个互惠主义关系,相互帮助，一个很好的感觉，所以期待是这其中会有一个寓意。

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