.. I'm afraid that's all we have time for... Thank you so much, professor... -Thank you.

今天的采访时间就到这了。,非常感谢您，-谢谢。

普林斯顿公开课 - 国际座谈会课程节选

I want to derive the last result in another way, then I will stop, and that's pretty interesting because it tells you the use and abuse of calculus.

让我用其他方法解答最后一个问题,然后今天就到这 这是一个挺有意思的题,因为它展示了微积分的正确用法和错误用法

耶鲁公开课 - 基础物理课程节选