Altruism" is the biologists' term meaning kindness,generosity, and evolutionary biologists have worked really hard to explain why animals might evolve to be kind.

利他主义是生物学术语,意思是善良，慷慨，进化生物学家努力去解释,为什么动物进化趋向善良。

耶鲁公开课 - 心理学导论课程节选

And then we'll move towards altruism, towards non kin.

然后我会讲对非亲人的利他主义。

耶鲁公开课 - 心理学导论课程节选

It actually can help us explain altruism.

这的确可帮我们解释利他主义。

耶鲁公开课 - 心理学导论课程节选