So we've tagged each of your numbers to your actual recitation, so we can see today which recitation actually is going to be doing the best in terms of clicker questions, who's going to get the most correct today.

我们已经将你们的学号,与你们参加的习题讨论小组关联起来了，这样通过回答选择题,我们就可以来比一比，哪个小组答对的人最多。

麻省理工公开课 - 化学原理课程节选