He's trying extremely hard to make an answer, and what he ends up doing is bringing that knowledge that he built up in Chicago, the knowledge that he gets from reading economics and sociology and Marxism.

他在里面倾其所学，让她明白,甚至用马克思主义,经济学和社会学中。

耶鲁公开课 - 1945年后的美国小说课程节选

Conversely, if you get an answer and it doesn't seem to make sense, then you've got to go back and ask, am I violating some of the assumptions, and here you will find the assumption that the particle had that acceleration a is true as long it's freely falling under gravity but not when you hit the ground.

反过来说,如果你得到一个结果,发现似乎是错的,那么你就应该回过头来问问自己,我是不是违反某些前提了,这个模型中,你就发现,只要质点在重力作用下自由下落,质点具有加速度a的前提是正确的,但是落地后就不成立了

耶鲁公开课 - 基础物理课程节选