互惠理论指出，互惠利他行为是指两个有机体之间相互交换适合度代价和利益的行为。
According to the reciprocity theory, the reciprocal altruistic behavior refers to the behavior of two organisms which exchange fitness costs and benefits.
萨特的人际关系理论经历了从“冲突论”到“互惠论”的转变。
Sartre's theory of human relations has changed from theory of conflict to theory of reciprocity.
借鉴生物共生理论，将金融共生关系分为偏利共生和互惠共生两类，并分析了金融共生关系的形成机理。
Using the symbiosis theory in biology, we divide financing symbiosis relationships into two types, commensalism and mutualism, and analyze the formation mechanism of these relationships.
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