The point of this advertisement is to make you feel like you don't have to know what the critic knows in order to read this novel.

这个广告的目的是让你觉得不用具备批评家的知识,也能读懂这部小说。

耶鲁公开课 - 1945年后的美国小说课程节选

And the point is that the second derivative of A, with respect to V and T in this order is the same as the second derivative of a with respect to T and V in this order.

问题的关键在于A的二阶导数，对V和T以这样一个顺序求导,和对T和V以这样一个顺序,求导是一样的。

麻省理工公开课 - 热力学与动力学课程节选