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I've never really known what to do with this.
我不知道对此该做些什么。
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And you've asked several people on the street . "I just can't get there! I don't know where I'm going!" and
你在街边向几个行人问路。“我没法找到目的地了，我不知道该怎么走！”
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I don't know how many of you have used that resource.
我不知道你们有多少人利用过该资源。
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And I don't know how to see my way through.
我也不知道该如何解开这些疑团。
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I don't know what order I should go in here.
我不知道该以什么顺序来讲
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I held off for a very long time, but I just got mine a month ago. And now I don't know how I live without it.
我拖了好长时间，一个月前才买的。而且现在我不知道离开它该如何生活。
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much more um, just... I don't know how I can describe... like hipster.
更注重，就……我不知道该怎么描述……就好像个时尚先锋。
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I don't really know what I do in my free time in London.
我真的不知道，在伦敦我没事的时候该干什么。
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but it's hard because I wouldn't know what to choose.
但是，这很难，因为我不知道该选什么专业。
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I'm not sure what I should do.
我不知道我该怎么做。
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But notice what this does. The first thing it does is, it says, let's check and make sure x is greater than or equal to 0. If it isn't, notice what's going to happen. None of that block is going to get executed, and it's going to come down here and print out a useful piece of information, which says, hey, you gave me a negative number. I don't know how to do this.
做的是和以前一样的事情,但是注释它做了什么，第一件做的事情就是,程序说，要去检查并且确信x是大于等于0的，如果不是的话，请注意会发生什么,下面的代码都不会被执行,程序会到这里来然后显示一些有用的信息,信息会说，嘿，你给了我一个负数,我不知道该怎么弄这个了。
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