Yeah, so maybe even among your roommates, maybe you don't need a contract because you can manage to achieve the same ends, by the fact that you're going to be interacting with the same person, over and over again during your time at Yale.

没错,就算你和室友没有书面协议,你们一样能达到预期的目的,因为在耶鲁大学上学期间,你们总要碰面

耶鲁公开课 - 博弈论课程节选