You can see the wisdom and experience in her face, which is very different from the baby's wondering expression.

VOA: special.2009.03.23

So now in this problem, we can do something slightly different, and let's use this expression here,and I will do that, then I'll stop for today.

对于这个问题,我们可以稍微做点变化,让我们用这个式子,就是这样,今天就讲到到这里

耶鲁公开课 - 基础物理课程节选