在大半个世纪里，大多数生物学家都不愿使用这些词，因为他们牢记着一条进化论的原则，即“进化不能倒退”。

For the better part of a century, most biologists have been reluctant to use those words, mindful of a principle of evolution that says "evolution cannot run backwards".

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作为进化论的创始人，达尔文认为对面部表情的普遍识别具有攸关存亡的价值。

As the originator of the theory of evolution, Darwin believed that the universal recognition of facial expressions would have survival value.

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这些发现与你对进化论的期望是一致的：那些喜欢交朋友和帮助别人的人能够收集足够的资源来度过艰难时期。

These findings are in agreement with what you would expect from the evolutionary theory: those who like to make friends and help others can gather enough resources to make it through tough times.

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The most altruistic behavior of all, giving your life to help another, can be explained in cold-blooded evolutionary terms.

最利他的行为，就是为他人牺牲自己，这也可以用毫无人情味的进化论来解释。

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A very old, very wrong view of evolution is that evolution has shaped animals such that they're merely survival machines.

非常古老错误的进化论观点认为,进化塑造了动物,他们只是幸存的机器。

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If evolution is survival of the fittest, nature red in tooth and claw, how could animals evolve moral feelings?

如果进化论是讲适者生存，在弱肉强食的自然界，动物怎么能进化出道德情感？

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