If evolution wired us up simply to survive, then it's a puzzle why animals would relate positively to other animals.
如果进化仅让我们生存,那么这是个谜题,为什么动物之间确定有联系。
Last time we ended with the following puzzle or question.
上一讲结束时我们留下这个谜题。
And this is a deep puzzle.
这还是个很大的谜题
It's a huge puzzle.
这是一个大谜题。
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