雄性動物對付頓飯就個體生存了。雌性需要有一定的條件才會產仔,延續種群。雌性動物的這種先天挑剔是社會發展的動力
雄性動物對付頓飯就個體生存了。雌性需要有一定的條件才會產仔,延續種群。雌性動物的這種先天挑剔是社會發展的動力
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