You can see the website if you want to download a copy of this to practice on it.

如果你们想练习的话,可以到网上自行下载。

麻省理工公开课 - 固态化学导论课程节选

So you'll got plenty of practice with this on your problem-set if you haven't already.

如果你们还没有做习题集的话,你们将要做很多这样的练习。

麻省理工公开课 - 化学原理课程节选

I am especially concerned about attendence, So if you have arch-practice these Tuesday afternoons and can't be here every week, you shouldn't take this course.

我很在意考勤，所以，如果周二下午,你有实践活动课,不能每周都出勤的话，建议你不要选这门课。

麻省理工公开课 - 电影哲学课程节选