But you don't know that there is an easy one for you down at number four 4 if you haven't bothered to look at number four.

但是你不知道,在数字4的时候会有一个简单的题目,如果你没有尝试去看数字。

麻省理工公开课 - 固态化学导论课程节选

See, this, you agree, is a complete solution to this miniature, tiny, Mickey-Mouse problem.

毫无疑问,这是这道超级简单的题目的,完整答案

耶鲁公开课 - 基础物理课程节选

I'm going to now start doing simple problems in mechanics.

现在我来讲解几个简单的力学题目

耶鲁公开课 - 基础物理课程节选