Animals that are altruistic even to the point of dying to help another, those genes will, under some circumstances, be preserved over the genes of people who are less caring.

有强烈利它主义的动物,甚至为其他动物牺牲自己，这些基因在某些情况下，就会被保存下来,而那些不关心他人的基因则不会。

耶鲁公开课 - 心理学导论课程节选

You chose Alpha; I'm assuming these were roughly your payoffs, more or less, you were caring about your grades.

你选择的是α,我想这差不多就是你的收益了吧,你关注自己的成绩

耶鲁公开课 - 博弈论课程节选