I want to mention that 5 you're going to get problem-set five is posted today, and I'll write which ones you can already do so far, because you don't have class on Monday.

我要指出的是,今天会贴出来习题集，我会给出你们现在可以做的题目，因为周一没有课。

麻省理工公开课 - 化学原理课程节选