If you look at the normal labs that are in many places, you have a lab on Thursday afternoons, and the labs are either two weeks ahead or two weeks behind the lecture material.

如果你了解其他地方,一般的实验室，比如在星期四下午有实验课，这些实验要么是讲座的两周前,要么是讲座的两周后,才进行。

麻省理工公开课 - 媒体、教育、市场课程节选

So hopefully you'll all look in the normal papers today, not just the scientific journals, and get to read something about chemistry.

所以希望你们在日常报纸，而不是科学杂志上阅读一些，关于化学的东西。

麻省理工公开课 - 化学原理课程节选