This has led biologists to conclude that altruism is a part of human nature.What they cannot decide is how or why it evolved.
这使得生物学家得出这样的结论：利他主义是人类本性的一部分，然而他们不能决定这种本性是怎样形成和样演变的。
Psychologists believe that traits such as selflessness and altruism have become part of our genetic make-up because they were attractive to mates.
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。
Make altruism and giving part of your life, and be purposeful about it.
为他人着想，支出你生命的一部门，有目标的去做。
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