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。

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and you just wandered around and, and wrote down your e-mail

你只需要来回看看并且写下你的电子邮件地址，

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Under that, the handwriting is very important here, your email address.

下面写上你的电子邮件地址，字要写清楚。

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