——今天上午迈克尔在史密斯老师的化学课上迟到了。 ——怎么会呢？据我所知，他上课从不迟到。

—Michael was late for Mr. Smith's chemistry class this morning. —How come? As far as I know, he never came late to class.

youdao

尽管教育部纲要允许学生在课上携带关掉的手机，但一些学校不允许携带手机上课。

While Education Department guidelines allow students to carry switched-off mobiles in class, some schools don't want a bar of them.

youdao

我甚至没有意识到，我是在开始上课后才走进教室的，这是我第一次在英语课上迟到。

I didn't even realize when I first walked in that class had already started.

youdao

So, these things here that you have in your hand, is the results of my spontaneously going to staples before class.

你们手头上东西，都是我们在上课前买到的。

哈佛公开课 - 计算机科学课程节选

And if you come and ask a question that you could have easily answered by doing the reading, coming to lecture, or using Google, they're going to have less patience.

所以如果你过来仅仅是问一个,你能很轻松的,通过阅读、上课、或者，在谷歌上搜索就能得到答案的问题，他们会失去耐心的。

麻省理工公开课 - 计算机科学及编程导论课程节选

All right. So let me start again by reminding you what it is that was done last time.

好的,我们开始上课,先回顾下上节课的内容

耶鲁公开课 - 基础物理课程节选