However, reciprocal altruism is not unconditional.
然而，互惠利他主义不是无条件的。
Reciprocal altruism and kin selection are the two main theories.
互利主义和亲族选择是两个主要理论。
The second form is reciprocal altruism, or “you scratch my back and I'll scratch yours”.
另一种形式则是互惠型的利他行为，或称为“狼狈为奸，唯利是图”。
The second form is reciprocal altruism, or "you scratch my back and I'll scratch yours".
第二种形式是互惠的利他主义，或者说“你帮我搓背我也帮你搓背”。
In particular, Trivers argues for several characteristics as functional processes subserving reciprocal altruism.
特别值得一提的是，特里弗斯指出，几种特性是促进互惠利他的功能性进程。
According to reciprocal altruism, evolution favors organisms that sacrifice their good for others in order to gain a favor in return.
根据互利主义理论，进化有利于为其他有机体舍弃利益以获得好感的有机体。
The basic assumptions in the game theory models of reciprocal altruism are based on the presupposition on rationality in behavior.
互惠利他主义的博弈论模型中的基本假定，都建立在理性预设的基础之上。
The basic assumptions in the game theory models of reciprocal altruism are based on the presupposition on rationality in behavior.
互惠利他主义的博弈论模型中的基本假定，都建立在理性预设的基础之上。
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