如果你盯着邮箱看，你一定不偏不倚的撞上去。

If you stare at the mailbox you're going to drive smack into it.

youdao

我邮箱的地址固定在我父母家，所以无论我住在哪，如果我想要这样做（或者我仅仅等待回去收邮件，给了我一个回家看父母的理由）。

My address for my mail is set to my parents' home, then forwarded to wherever I live, if I choose to do so (or I just wait and go back & pick it up, gives me a reason to see my parents).

youdao

看一眼邮箱，发现竟然有382封邮件！ ！

Have a look at your emails. 382!

youdao

But when you start writing programs, especially when we get to web-based stuff where you want -- to check the user's input -- is it valid, is it an email address, -- and all these different scenarios -- it's actually often useful to be able to just enumerate them or rattle them off using this switching construct instead.

但是当你看是写程序时，特别是当我们,使用基于网络的东西，你想要,检查用户的输入-,它是合法的吗？它是不是一个电子邮箱地址？,所有的这些场景-,实际上它常常是有用的，当你用枚举结构列举它们,或者用它来快速地来说出它们。

哈佛公开课 - 计算机科学课程节选