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It's the most simple-- or often called a bill-- a discount bond does not pay interest; it's sold at a discount.
它是最简单的,经常被称为国库券,它是一种贴现债券,且不付息,并以折扣价发行
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In fact, I used to go to church in Harlem. And it was... We would walk to and from church.
事实上，我过去经常去哈莱姆的教堂。它……我们会从家里步行到教堂，然后再从教堂步行回家。
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And I'll just point out here also, this is a conversion factor you'll use quite frequently -- many of you, quite on accident, will memorize it as you use it over and over again.
你们会经常用到，所以你们可能,会不小心记住它的值，但我们并不会在,任何考试中。
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First is the body mass index, you're going to see this a lot and you--some of you probably know about it already because it's out there in the popular literature.
首先是体重指数,我们会经常碰到这个概念,你们也许已经知道这个概念了,它经常在科普读物中出现
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But you see the difference. Great question, and a very important thing to understand, and that's why I'm belaboring this point, since this is where people tend to get pretty confused, and this is why mutation is very important to understand. Yeah.
但是你们已经发现区别了，这问题挺好的，并且有重要的一点需要我们去注意的是，人们经常对可变性这一点感到很迷惑，但是可变性是很重要的,我们需要理解它,这也是我经常强调这一点的原因。
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Yeah. We talk about the San Francisco Chronicle all the time. It's like the main newspaper for the city.
是的。我们经常谈论《旧金山纪事报》上的新闻。它是这里的主要报纸媒体。
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It's used continuously as a movie score, television, radio commercials.
它经常出现在电影原声，电视节目,电台广告中
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So leadership is kind of a big word that you see written probably too often these days, in too many newspaper articles, and it probably comes up in too many Yale classes, and I don't claim to know anything about leadership.
领导力这个大词,最近一直都很火啊,我们经常能在报章中看到它,在耶鲁大学的课堂里也能经常听到,我不敢说对领导力有多么深刻的见解
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I used to have a dog that I would walk in this area a lotwhen he was very young.
我以前有一只狗，它很小的时候，我会经常在这里遛狗。
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And that it's because it is partaking of exactly the same motivation as that urge in the spirit that we usually associate with the spiritual.
这是因为它在实质上,和我们与宗教经常联系,在一起的精神力量。
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If it's the fraternity where the people take the message and you get it.
要是你经常通过男生联谊会收发信件,就把它的地址写下来，这样方便联系。
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LS And what very often happens if you do an LS in your account, to list your files, there's a whole lot of stuff in here at the moment -- and I don't have it here - but what you'll often see -- I'll just fake this demo -- is a file called core.
经常发生的是，如果你用你的账号做一个，来列出你的文件，此刻这里有一大堆元素,-它不在这里,但你们将经常看到--我将篡改这个演示-,是一个叫做core的文件。
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and it's also like always, almost like a... I don't know, a potpourri
它也经常，几乎是……我不知道怎么说，大概是各种风格的集锦，
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You reduce a lot of the health risks, if you exercise often.
如果你经常运动的话，它会帮你降低许多健康问题的风险。
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It's pretty much called, like the Switzerland of the Arab world.
它经常被叫做阿拉伯世界的瑞士。
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It's always... it's a lot easier over there. But usually it's,
它总是……在那里容易很多。但经常是这样的，
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So like, usual...because it's very international, too many nationalities,
所以，经常……因为它很国际化，有太多不同国籍的人了，
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and Americans are very good at talking about it,
并且美国人经常谈论它，
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It was always called Portobello Antique Market.
它经常被叫做波托贝洛古董市场。
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I use iTunes quite a bit to download songs and movies and some things like that. It's great.
我经常用iTunes下载歌曲和电影那一类的东西。它很棒。
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You will often hear the word "got," which basically means "have" or "need to."
你会经常听到一个词“got”，它的基本意思是“有”或者“有需要”。
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OK. In particular, let's go over to here, and let me show you a second example.
一定是个坏办法，它经常是解决问题的。
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One way to think about it, if we want to use a classical analogy, which often helps to give us an idea of what's going on, is the spin of an electron, we can picture it rotating on its own axis.
如果我们用一个，经典的比喻来考虑它的话，这经常会帮助我们建立起一些概念，就是我们可以把电子的，自旋想象是它绕着轴自转。
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It oftentimes repeats and it can be symmetrical in that sense.
它经常重复并且感觉比较对称。
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This is actually very representative of when you do research in the laboratory, you will find often things do not work quite exactly as they worked 20 minutes ago when you just checked it in your office, for example.
在实验室做研究时,这个实际上是非常具有代表性的，举个例子,当时只是在办公室核查它时,你经常会发现事物无法,像它们20分钟之前那样精确的工作。
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It's all over the place, and as soon as I start to play it, at least once we get in to it, you'll say, "Oh, yeah, i've heard that."
我们经常会听到它,只要我一开始放,至少当我们听到主要部分,你们会说,原来这样啊,我以前听过
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So that means that we don't have to worry about things like wave functions when we're talking about Lewis structures, but because they're so simple to use and because they so often predict the electron configuration of molecules accurately, we end up using them all the time in chemistry, so it's very valuable to know how to draw them correctly and to know how to work with them.
因此这也就意味着我们在讨论路易斯结构的时候,不需要担心波函数之类的东西，但是由于路易斯结构不仅简单易用,而且用它来预测分子的电子排布,经常可以得到非常精确的结果，结果我们在化学中一直都在用它，因此知道如何正确地画出并运用,路易斯结构是非常有价值的。
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So what actually turns out the reality is that h e 2 does exist, but it exists as the weakest chemical bond known, and it wasn't, in fact, even found to exist until 1993, so I can assure you this is not a bond that you see very often in nature, and it is a very, very weak bond.
实际上He2键是存在的，但它是目前所知的最弱的键，直到1993年它才被发现，所以我可以向你们保证在,自然界你们不可能经常看到它，它是种非常非常弱得键。
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