从进化论的角度看，权衡得失对动物来说是非常明智的。
It would be very wise for an animal to weigh gains and losses from an evolutionary perspective.
从纯进化论的角度来说，一夫一妻制的人，其基因在下一代中被复制的次数更少。
From a purely evolutionary point of view, the guy who's monogamous will have fewer copies of his genes in the next generation than a guy who's not.
从进化论的角度来说，亲人之间的和睦相处是无可厚非的。
We're nice to our families. From an evolutionary perspective, that makes sense.
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