But if you say, well, I don't know how to do this, I am not going to bother, don't grade the paper.

但是如果你说，好吧，我不知道怎么做这个，我想麻烦，别给试卷评分。

麻省理工公开课 - 固态化学导论课程节选

Other people might say, well you know, I'm really an adventurer--I don't care too much about risk-- I want the much higher return.

其他的人可能会说，你知道的，我就是一个投机商我不怎么在乎风险-,我只想要更高的收益。

耶鲁公开课 - 金融市场课程节选

So, for those of you who have never heard French before, when you hear somebody say, "Je ne sais pas" you could say, "Remarkable!

因此,对于那些从未听过法语的人来说,当你听到有人说,"我不知道",你可能会说,"太神奇了

耶鲁公开课 - 心理学导论课程节选

Please don't anybody tell me late - any time after today you didn't know when the mid-term was and therefore it clashes with 17 different things.

所以以后千万别跟我说,你不知道什么时候期中考试,然后还在考试那天安排大一堆事儿去做

耶鲁公开课 - 博弈论课程节选

So when you're seven you think, "I don't know.

你还小,所以你说,我不知道

耶鲁公开课 - 死亡课程节选

I'm taking advantage of the fact that start is going to be a point, and I'm just directly saying, John give me your x-value.

我利用了开始是一个点这个事实,然后我就直接说，返回给我你的x值，因此我不知道。

麻省理工公开课 - 计算机科学及编程导论课程节选

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。

麻省理工公开课 - 计算机科学及编程导论课程节选