It wasn't selfish genes that wove these people together. It was social skills, the ability to form intimate groups with non-kin.
并非自私基因将这些人汇集到一起，而是社会技能，与不具有亲属关系的人形成亲密团体的技能。
Indeed, we scientists use metaphors all the time when we communicate with one another: we speak of selfish DNA and orphan receptors and proteins that serve as chaperones and genes that hitchhike.
的确，我们科学家彼此交流时，一直都在用比喻：我们说自私的DNA，孤儿接收者，蛋白质像是伴侣，而基因像是搭车旅行。
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。
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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