"I never done it in my life - I don't,know kind of hard, that's why I am still here - unemployed."

VOA: standard.2010.05.15

The third derivative, unfortunately, was never given a name, and I don't know why.

遗憾的是三阶导数没有专门的名称,我也不知道这是为什么

耶鲁公开课 - 基础物理课程节选