Newton is not going to come and tell you what force the spring will exert when it's pulled by some amount.

牛顿不会过来告诉你,弹簧被拉伸一定量时会产生多大的力

耶鲁公开课 - 基础物理课程节选

Some of you are probably going to be doctors and you don't know why I'm going to do special relativity or quantum mechanics, but you don't know when it will come in handy.

你们中的有些人可能会成为医生,但你们现在不能理解,我为什么要讲相对论和量子力学,但是说不定什么时候,你就用上了呢

耶鲁公开课 - 基础物理课程节选

That could be an epigraph on this course, if you like, because in the end when this Civil War will finally come both sides will say over and over and over again that they are only fighting for liberty.

你愿意的话,也可以把这两个词记下来,因为在最后,当内战最终打响的时候,双方都会一遍又一遍地重申,他们只是为了自由而战

耶鲁公开课 - 美国内战与重建课程节选