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。
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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