But I often get mails back from students' posts I didn't correctly read their handwriting on the email address.

我给学生寄的邮件经常被退回来,因为他们的字太差,我总是认错他们写的邮件地址。

麻省理工公开课 - 电影哲学课程节选

I want to back up now because I think it's important to fill in a little bit of the historical context behind that long but important prose treatise.

我想要退回去往前看是因为我认为,补充一些历史背景对于,解读那篇冗长却又很关键的政论是很重要的。

耶鲁公开课 - 弥尔顿课程节选

So, what we say here is we need to take a step back here and come up with an approximation that's going to allow us to think about using the Schrodinger equation when we're not just talking about hydrogen or one electron, but when we have these multi-electron atoms.

所有我们这里要说的是,我们需要退回一步,做一个近似,那样可以使我们用,薛定谔方程来考虑,让我们不是仅仅在讨论氢原子或者,一个电子的时候，而是多个电子的原子。

麻省理工公开课 - 化学原理课程节选

Some people want to go back, some people think there's a lot of anger about the subprime crisis and there's some anger expressed against the financial community.

有些人想退回到过去,有人认为,次贷危机,让很多人感到愤怒,有些人把怒气指向金融从业人员

耶鲁公开课 - 金融市场课程节选

How do I go back if it isn't?

如果不是的话我该怎么退回上一步呢？

麻省理工公开课 - 计算机科学及编程导论课程节选