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If a person's heart stops, would you know how to perform CPR?
VOA: special.2009.05.20
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Cause when you can actually manipulate a computer's memory at this low level, you can steal people's passwords, you can steal their data if you know how that memory is laid out.
因为即使是在这么低的权限下,你也能熟练控制电脑的存储器,你就可以窃取别人的秘密，如果知道相应数据位于哪里的话,你也能窃取别人的数据。
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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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"People can look at things and be curious about them, but if you are an explorer you want to know why and how and maybe develop an experiment to test the hypothesis."
VOA: standard.2010.06.21
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I don't know if you know how a spark plug works, but for the electrical current to fly into operation in a spark plug, the two points of contact have to be gapped.
我不知道你们是否知道,火花塞是怎样工作的，在电流通入火花塞中使它运转之前，两个接触点之间需要有空隙。
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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 for example, if you know how to draw an s orbital for a hydrogen atom, then you already know how to draw the shape of an s orbital or a p orbital for argon.
举个例子，如果你们知道如果画,氢原子的s轨道，那么你们已经知道如何去,画氩的s轨道和p轨道的形状。
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If you did know how much time you had left, ? how would you act differently from what you're doing now?
如果你确实知道了自己还剩多少时间，你会和你现在的行为有不同吗？
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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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From then on,if you accept the analysis and the assumptions or the estimates that underlie it, then we pretty much know how to construct portfolios.
如果你们理解了整个分析过程,假设前提以及各项资产的有关估算,就能知道该怎样建立一个投资组合
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I don't know if you realize how rare that is,in a college.
这在大学里很少见。
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If you don't know how to measure anything, you are doing algebra and trigonometry.
如果你不知道如何进行测量,你就是在研究代数或者三角函数了
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.. And that's where a lot of...you know if a proper government can try figure out how to increase the revenue intake and then ... how to redistribute...somemore effectively.
所以就,如果政府能努力想办法,提高所得财政收入,和更加有效地重新分配支出。
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Now if you think around to the people you know, you probably are aware that there are pretty important differences between people and how much they eat, and then how well those calories get banked.
现在如果想想周围你认识的人,你可能意识到,个人的进食量,以及储存能量的能力之间,存在相当大的差异
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You need to know if it's an equilibrium, and you also need to know how many components you have in your system So, a glass of ice water with an ice cube in it, which is a heterogeneous system, has only one component, which is water, H2O.
要知道它是不是平衡的，你还需要知道,你的系统中有多少组分,一杯放了冰块的水，虽然它是个非均匀系统，但它只有一种组分，那就是水。
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and if you're a good test taker, and you know how to take the test
所以如果你善于考试，知道如何应试
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If you could image how the heart is moving, you would know a lot about its function.
如果你对心脏进行动态造影,你就会了解它的很多功能了
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This is useful especially when we get to details like forensics and looking at data on a hard drive, - 'cause if you don't know how much store-- how many bits are composing your file, you're never gonna recover that data or be able to access what you're looking for.
这是很有用的，尤其是在法庭上,查看硬盘驱动器里的数据时，如果你连-,文件有多少比特都不知道，你如何去恢复数据,获取你想要的信息呢。
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How does that happen? You know, you've got to appeal to social forces if you're going to talk about change.
这是怎么回事？,谈到这个变化,我们必须要理解社会中的力量。
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Well if I-- you know, with let me say it differently. I don't need to worry about how checking is done, it's handled inside of that function.
好，如果你们知道，抱歉，让我们换种说法,我不必担心检查工作,是则会么做的，这是在方法体内部进行的。
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You can go ahead and use that equation, or you could figure it out every time, because if you know the total number of nodes, and you know the angular node number, then you know how many nodes you're going to have left.
你们可以直接用这个方程，或者每次都自己算出来，因为如果你们知道了总的节点数，又知道角向节点数，就知道剩下的节点数是多少。
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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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If I give you a function, you know how to take the derivative.
如果我给你一个函数,你就知道如何求导
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If your dealer quotes you a discount rate of 2.51%, you know how to convert that into the price and that's all that matters--all that really matters is the price you have to pay.
如果经销商告诉你折扣率是2.51%,你要知道如何转换成价格,真正和你有关系的,是你需要付多少钱
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It doesn't mean anything until you know how many shares are outstanding because if I own one thousand shares and then you look it up and find out how many shares are outstanding-- there are one thousand-- you say, hey I own the whole company.
这毫无意义,除非你知道总共发行的股票数量,如果你有十手股票,但后来发现,总共发行的股票数量,就是一千股,你就可以说,整个公司都是我的
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You've got to make sure that if you explain to others how to do this problem, then somebody else contributes to something else, but you know what everybody contributed in the end.
你得能保证,如果你和别人解释了题目的解法,然后另一个人对别的题目又有独到见解,最后你知道每个人都没有浑水摸鱼
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You want to talk about it systematically, but how can you talk about anything systematically if you don't know what it is?
人们总希望系统化地谈一件事，但是你一点都不了解它,怎么能系统化地谈它呢？
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It'd be actually much more valuable for you to know how to ; right?--if you're getting along in Western civilization; or how to use computers,or sexual technique, or how to speak other languages.
懂得如何修车,对吗，如果你要融入西方文明;,还要懂得如何使用电脑，性技巧，说一门或多门外语。
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You know how pressure changes with temperature at constant volume if you know the equation of state.
如果你知道状态方程,知道在体积恒定的时压强如何随着温度变化。
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Well, it's, you sort of know how you'd do it if this was grammar school right?
你怎么解决这个问题呢？,很简单？
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