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And one day you want to go to the cemetery or something, you can't do it because you don't know where they are.
VOA: special.2010.02.01
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You know, frankly, when it comes down to it, people want to give money and get something in return.
坦率地说，归根结底一句话，人们在有所投入的时候也是期待有所回报的。
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The problem is, I want to know if, in fact, I've got something that's not of the form I expect.
问题是,我希望知道如果输入的。
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But just the fact that the idea came up, that we know that there are people out there thinking about this, seemed to be something that people want to talk about,".
VOA: standard.2009.12.18
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You know, if you want to measure the potential energy of something in a gravitational field, you have to define the zero somewhere, right, because it's arbitrary. You can set it anywhere you want. It's the same with enthalpy.
你知道，如果你想测量重力场,中某种东西的势能，你需要，在某处定义一个零点，对吧？,因为势能的值是任意的,你可以把它设定在。
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If you want to know something like when do you hit the ground, I think it's fairly clear what you have to do.
如果你想知道车子何时落地,我想你该做什么就很明显了
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I want to know what something definitely means.
我想知道事物究竟是什么意思。
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I don't understand why you'd want to take a pill to fix something that we know little about.
我不明白为什么你会愿意吃药片来治好一些我们甚至都不清楚的毛病。
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Yet, it's something very important, as we would want to know in any play or novel or movie.
但这之间有些很重要的环节，就像我们想要欣赏任何表演，小说或电影时,会想深入发掘一般。
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When you want to know if something is transparent to visible light or not, here is the mystery material and here is visible light.
而我们知道,物体是否对可见光透明，这里是神秘的材料，这里是可见光。
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I want to know if something's equal to something.
我想知道一些事情是不是等于另一些。
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It was invented by a mathematician called Bellman. And he was at the time being paid by the Defense Department to work on something else. And he didn't want them to know what he was doing. So he made up a name that he was sure they would have no clue what it meant.
一点儿道理也没有,它是一个叫Bellman的数学家发明的,那时受聘于国防部研究一些其它东西,它不想让它们知道她在研究什么,所以它编造了一个,它们不会知道意义的词语。
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That means, when I take two derivatives, I want to get a, then you should know enough calculus to know it has to be something like at^, and half comes from taking two derivatives.
也就是说,当我想求二阶导时,得到了a,你应该有足够的微积分知识,才能知道必须有类似at^的项,而这个1/2则是因为求了两次导数
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