利他行为可以分为亲缘利他、互惠利他与纯粹利他三种形式。
Altruism can be divided into three sorts: relative altruism, bi lateral altruism and pure altruism.
关于利他主义还有别的一些理论，但最有意思的一种认为这一切都是有亲缘关系的。
There are several other theories about altruism, but one of the more intriguing ones is that it's all relative.
关于利他主义还有别的一些理论，但最有意思的一种认为这一切都是有亲缘关系的。
There are several other theories about altruism, but one of the more intriguing ones is that it's all relative.
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