Natural selection, which usually promotes only selfish behavior, can reward this kind of cooperative behavior, called kin selection, because relatives contain many of the same genes.

通常只会鼓励利己行为的自然进化，也会奖励这种合作行为，称为血亲进化，因为亲属之间包含很多相同的基因。

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So there is a conflict of wanting to be close to your kin and kind, but not too close.

因此，想和自己亲戚或同类很近，但不能太近，这是一个冲突。

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