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。
Selfish altruism is the basic and permanent moral principle of good, always applicable to everyone's conduct.
为己利他是基本且恒久善原则，它应该且能够指导每个人的恒久行为；
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