通常只会鼓励利己行为的自然进化，也会奖励这种合作行为，称为血亲进化，因为亲属之间包含很多相同的基因。
Natural selection, which usually promotes only selfish behavior, can reward this kind of cooperative behavior, called kin selection, because relatives contain many of the same genes.
它既是氏族血亲之爱自然情感的遗留，又是维系社会人际关系的普遍存在的道德义务和责任。
It could be considered as the remaining love of clan society between blood relationship and natural emotions, and it is considered as universal ethics among peoples.
它既是氏族血亲之爱自然情感的遗留，又是维系社会人际关系的普遍存在的道德义务和责任。
It could be considered as the remaining love of clan society between blood relationship and natural emotions, and it is considered as universal ethics among peoples.
应用推荐