如果你有好的基因还很无私、乐观、好动，但依然觉得自己情绪萎靡不振，那就让时间来说明问题吧。
If you have the right genes and are selfless, optimistic and active but still find yourself down in the dumps, just give it some time.
心理学家们认为，无私和利他主义等品质已经成为我们基因的组成部分，因为这些品质对伴侣来说极具吸引力。
Psychologists believe that traits such as selflessness and altruism have become part of our genetic make-up because they were attractive to mates.
研究表明，一旦基因相似性高，虐待儿童比率就会相对较低，此外，你们还会更无私，更愿意为那些与自己基因相近的人做出牺牲。
Child abuse rates are lower when similarity is high, and you'll also be more altruistic and willing to sacrifice more for someone who is more genetically like you, research shows.
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