Namely:social relations of altruistic behavior, Personal factors of altruism behavior.
即：社会关系造成的利他行为； 个人因素造成的利他行为。
There's also a less flattering reason: denying the possibility of pure altruism provides a convenient excuse for selfish behavior.
还有一种不那么“光鲜”的原因：否定纯粹利他主义的可能性可为自私行为提供方便的借口。
This sharing behavior between an adopter and an orphan is a clear sign of altruism, the researchers conclude online this week in PLoS One.
这种在收养者和被收养者之间的分享，就是一种利他主义的明显标志。这些研究人员在《PLoS杂志》网上发表文章，作出这样的结论。
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