Price competition two firms competing with one another in prices can have a Prisoners' Dilemma aspect about it.

价格竞争,两家互相打价格战的企业,可能会陷入囚徒困境

耶鲁公开课 - 博弈论课程节选

It's the sort of thing that we can put on a scale and prod with a stick and the biologists can study, presumably made up of various kinds of molecules, atoms and so forth. So we've got the body.

这是一种我们可以称重,可被棍打,可被生物学家研究的东西,想必是由不计其数的分子,原子等构成,于是我们有了肉体

耶鲁公开课 - 死亡课程节选