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Let us say I want to sell my car but I do not know exactly how much it is worth.
VOA: special.2009.04.12
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That's an idea that struck people intuitively at various times in history, but they didn't know how to do these calculations.
在历史上,人们很多次,直觉地感知到了这一点,但是他们不知道怎么去计算
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And secondly, I think that, even if they don't know how to do a problem,
二是，我觉得，即使他们不知道怎么做一道题，
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Doctors do not know exactly how the brain stimulation works to help patients with Parkinson's.
VOA: special.2009.02.03
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Python You can pick up another language in a week, couple of weeks at most, once you know how to do Python.
只要学会了，你可以在一周之内学会任意一种语言，最多两周。
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"You do not know how bad that is going to be. There have been children who have died from the swine flu,".
VOA: standard.2009.12.18
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All right so we know how to do this.
研究了等温过程后。
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They know how to win over there,". The differences in opinion among veterans over what to do in Afghanistan reflect a broader uncertainty among the American public, says pollster Peter Brown.
VOA: standard.2009.11.16
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or know how to do the homework, it's just more important having you there,
或者怎么做作业，有家长陪伴在旁边更重要，
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Dr.Vallenas says many mothers are discouraged from breast-feeding because they do not know how to get their baby to latch on properly to the breast's nipple, or because they suffer pain and discomfort.
VOA: standard.2009.08.01
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Depending on what kind of chemistry you go in to, you might accidentally memorize parts of the table, which is fine, but what you really want to know how to do is know how to use the periodic table.
取决于你今后从事哪个方向的化学研究，你可能会不经意地记住周期表的某一部分，这就够了，但是要注意,你真正需要知道的是如何使用元素周期表。
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"that are against this move-are asking is this, 'How do we know that the Americans and the West are basically going to let the Russians live up to their promise of giving the uranium back?
VOA: standard.2009.10.28
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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。
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"I would say that it is my crisis training in the airline industry that helped me know at that moment when you feel emotionally paralyzed what to do and how to start communicating that sad news."
VOA: standard.2010.02.25
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I can change everything overnight; it does happen. I put that in for a reason because sometimes some of you have not taken a physics course and you don't know how to do well in physics and slowly you catch on and by the time it's Final exam you crack the code; you know how to do well.
我能一夜之间扭转乾坤,确实有过这样的例子,我这样做是因为,有时你们中有人可能以前没上过物理课,不知道怎样学好物理,但慢慢地你赶了上来,到期末考试的时候,你忽然灵光一闪,考起试来得心应手
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How do we know that they are not going to keep it all?" The United States and allies France and Russia have supported the IAEA draft deal with Iran as a means to alleviate concerns that Tehran is using its nuclear program to develop atomic weapons covertly.
VOA: standard.2009.10.28
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If you know how to do it, you can get it for really cheap.
要是你知道怎么做的话，你就可以买到很便宜的票。
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Unless you tell them what to do they're not gonna know how to do it.
除非你告诉它要做什么,它自己是不知道做什么的。
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Now, you know how to make women do worse on math tests too, like that, and this has a demonstrative effect.
你们也知道怎么让女同学考数学考不好，像这样，这样的作用非常显易而见。
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Now the question you'd need to ask yourself is how do you know this didn't happen to you last night?
现在你要问自己的问题是,你怎么知道,昨晚你没发生这样的事？
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I just want to know the bottom line; how much do I have to pay for the whole company?
我只想知道底价,也就是买下整个公司最少要花多少钱
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But that formulation seems in many ways to be question begging. How much precision does the subject allow? How do we know?
所允许之外的精准,但这样的逻辑本身即,在很多方面启人疑窦？
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I don't know how to turn it on, I don't know what to do.
我不知道怎样打开，不知道要做什么。
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Population intake: how do we know what to recommend to people to eat?
总体摄入量,我们如何知道,该建议别人吃什么
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I'd be interested to know, gentleman down here, how do you do this?
我很好奇,我想知道,下面这位男士,你是怎么听的
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How do cells in your brain know which proteins they ought to be making, and how do cells in the pancreas know which proteins they ought to be making?
你的脑细胞怎么知道,该生成哪些蛋白质呢,而你的胰腺细胞又是怎么知道,不该生成哪些蛋白质呢
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So it's a short problem set, but make sure you know how to do those problems.
因此这是个小问题集,但是确保你懂怎么解决这些问题。
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You'd pull out your pencil and paper, you can do it as a matrix inversion if you know how to do that, or you can just simply do substitution of one equation into another to solve it.
你知道你在小学的时候是怎么做的对吧？,你拿出你的笔和纸,如果你会的话,你可以解一个方程组,或者你可以单纯地。
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so we know how to do this, and we know this thing when it hit these stops, v2 the pressure with p2, and the volume was V2.
所以我们知道怎么计算，当活塞到达这两个挡板时，压强是p2，体积是。
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And yeah, I know you know how to do it, but let's think about what might happen if I wanted to do that.
对，我知道你们知道该怎么做，那么让我们看看如果我,想要完成的话会发生什么。
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