The other quick thing I want to say is that I do have office hours today from 3 to 5, so feel free to stop by if you have questions about problem-set 3 that you're finishing up.

我还想说一件小事,我今天的答疑时间是三点到五点，如果你对于第三次作业还有任何疑问,请在这个时间段来找我，不必客气。

麻省理工公开课 - 化学原理课程节选

And Friday is the last day of the contest, 5:00 PM.

周五下午五点进行最后一场考试。

麻省理工公开课 - 固态化学导论课程节选