But you also notice the sense of limitation and the vulnerability associated with the physical state of virginity here.

但是你们也要注意到限制和弱点的意义所在,那是与身体的贞节状态相联系的。

耶鲁公开课 - 弥尔顿课程节选

Hence, selfish genes will lead to altruistic animals because, to the extent that evolution operates at the level of the genes, there's no hard and fast distinction between your own body and someone else's body.

所以，自私基因会导致利他行为，从这个意义上说,进化在基因层面进行，你自己的身体和别人的身体,没有严格差别。

耶鲁公开课 - 心理学导论课程节选