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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”。
The second form is reciprocal altruism, or "you scratch my back and I'll scratch yours".
youdao
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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”。
The second form is reciprocal altruism, or "you scratch my back and I'll scratch yours".
youdao