互利主义和亲族选择是两个主要理论。
Reciprocal altruism and kin selection are the two main theories.
心理学家提出了一种可能的解释，称之为“亲族选择”假说。
One possible explanation is what evolutionary psychologists call the "kin selection hypothesis."
心理学家提出了一种可能的解释，称之为“亲族选择”假说。
One possible explanation is what evolutionary psychologists call the "kin selection hypothesis."
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