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

The animal that eats its offspring, those genes are a biological dead end.

吃掉自己后代的动物，他们的基因走进了生物学的死胡同。

耶鲁公开课 - 心理学导论课程节选

Well, let's see, a biologist might study, or a zoologist might study, cats.

比如说,生物学家,或者动物学家可能会研究猫

耶鲁公开课 - 死亡课程节选