PROFESSOR: All right. As everyone finishes getting settled in, why don't you take 10 more seconds on the clicker question here, and let's see how you did on that this, this is very similar to the clicker question that we had on Friday.

教授：好了，大家，都坐下来了，给你们10秒钟,回答这个问题，让我们来看下你们学的怎么样了，这和上周五的问题,很相似。

麻省理工公开课 - 化学原理课程节选