After three years he entered the College Rollin, where he started drawing classes.

三年后他进入罗林学院，开始修绘画课。

youdao

I was not feeling well on Friday, but I still went to school anyway. I made it through the first three classes, but then my illness started to take over.

在星期五时，我感觉不太舒服，但我还是到学校上课，我撑过了前面三节课，但后来我的疼痛还是(开始)把我击倒了。

youdao

What have we done over the last three or four lectures? We've started introducing you to classes of algorithms. Things that I'd like you to be able to see are how to do some simple complexity analysis.

我们在过去三节或四节课中讲了什么？,我开始向你们,介绍算法的类型,我想你们知道的是,如何做一些简单的复杂度分析。

麻省理工公开课 - 计算机科学及编程导论课程节选