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You know when you add 2 polar forms, you add the radii together, you don't add the angles together, you need to do it in Cartesian form.
表示形式的不同理解，返回给你了不同的值，这也就带来了一系列的问题，第二个问题是。
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I don't know if you know this, but for a long time when movies took place in New York,
我不清楚你是否知道，很长一段时间，电影里发生在纽约的场景，
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Homework is when you really figure out how much you know and don't know.
作业能让你真正弄清楚,自己对知识的掌握程度
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You could see this when you hear a language you don't already know.
当你听到一种你从未听过的语言时,你便会理解这个现象
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Well you know when you walk past those soft drink machines you're being marketed to even if you don't buy it because it's that big colorful thing that stands out.
那么当你在经过这些饮料贩卖机时,你就接受了营销,即使你没有买饮料,因为这个又大又花哨的东西太显眼了
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What I was going to say is that you could, at least theoretically, strike with your spear in a overhand manner or you could strike with it in an underhand manner, the only thing is I don't know how you do that underhand when you're in the middle of a phalanx.
我要说的是,士兵们能够,至少从理论上来说,可以自上而下地刺矛,也可以这样自下而上地刺矛,我不太清楚在方阵中,士兵们怎么能够自下而上地刺矛
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When the uncertainty gets that big, you don't know which came first.
当不确定度到那么大的数值时，你不知道谁是第一个到达的。
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PROFESSOR: Great question. So the question is, how do you choose an algorithm, why would I choose to use a pseudo-polynomial algorithm when I don't know how big the solution is likely to be, I think that's one way to think about it.
教授：问得好，所以问题是，你怎样选择算法，为什么当我,不知道解决方案会有多大的时候,我要选伪多项式算法呢，我想这是一种思考问题的方式。
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The fact that you could die and you don't know when you're going to die doesn't yet entail that you could die at any minute, at any moment.
你可能会死和你不知道,自己什么时候会死这个事实并不能得出,你可能随时随刻死的结论。
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Because you see, also motivation and energy-- you don't need research for that, you know that when you are feeling good, you have more motivation, you have more energy-- of course, there is a lot of research to back that up.
因为动力和精力-,不需要研究就能明白，你知道感觉好时，动力和精力更充沛-,当然有很多研究支持这一点。
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You know, when I go out, I mean, I don't go down to Pier 39 or Fisherman's Warf, you know. I mean, It's...
当我来的时候，我不会去39号码头或者渔人码头。我的意思是，
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So it's not to be used when you just feel sort of "Nahhhh, I don't know."
所以，当你仅仅是觉得“嗯……我不清楚”的时候，不能用这个句型。
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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
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Okay, first of all, because everything relies on self-report there's no machine, for the most part, that can do objective measures of this, you don't really know when people are telling you what they're eating.
好,首先,因为任何事都是建立在自觉上,大多数环节没有机器参与,这样的方式比较主观,你并不需要,人们告诉你他们所吃的是否真实
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The trouble is, you just don't know when that explosion took place, and since there are several periods in this general area that we're talking about now, in which something big happened, some great change takes place, it turns out different people want to have their explosion at different times.
问题是,你不了解火山爆发的,确切时间以及这种爆发,在这个区域又延续了很多个时期,这些时期发生了许多重大事件和重大变化,结果就是不同人对,火山爆发的时间推测各不相同
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So when you're seven you think, "I don't know.
你还小,所以你说,我不知道
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Some of you are probably going to be doctors and you don't know why I'm going to do special relativity or quantum mechanics, but you don't know when it will come in handy.
你们中的有些人可能会成为医生,但你们现在不能理解,我为什么要讲相对论和量子力学,但是说不定什么时候,你就用上了呢
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There's all these pleasures of experiencing art and seeing a beautiful sunset. And I don't know about you, but at least when I imagine the rat lever thing, it's a sort of simple, undifferentiated pleasure.
体验艺术是快乐的,观赏美丽的日落是快乐的，我不了解你们，但当我想象老鼠杠杆时，那是一种简单，单调的快乐。
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