But I am telling you this after you already signed up for the class so it is too late to leave.

我在你们选了这门课后才挑明,想退课也晚了。

哈佛公开课 - 幸福课课程节选

I want you to understand what you've signed up for.

我希望你们都了解你们都选的是什么课。

麻省理工公开课 - 固态化学导论课程节选

If you want to get those e-mails, you got to sign up for the course because I push a button and it goes to anybody who's signed up there.

如果你想收到邮件的话,你得选我的课,因为我点一下按钮,邮件就发给选课的同学了

耶鲁公开课 - 基础物理课程节选

So, it seemed like a good start for me, pre-med/bio, and I signed up for my bio class -- I found out, as Professor Drennen did, that I had to take chemistry as well. I wasn't as upset, I was sort of a neutral chemistry person at this point, but I thought it was pretty smart to get it over with on the first semester, so that's what I did.

一个既在科学上有挑战又能帮助他人的职业，从医学预科或者生物起家-,我参加了生物课，我和Drennen教授一样，我也必须要上化学课，我并没有很不爽,我当时对化学的态度很中立。

麻省理工公开课 - 化学原理课程节选