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Senator Kit Bond of Missouri told Fox News Sunday many of those returned to Yemen are now active in al-Qaida.
VOA: standard.2010.01.03
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We see that the radius is shorter, so that means that the nitrogen-nitrogen bond is going to be shorter.
我们看到这个距离更短，这就意味着,氮与氮之间的键应该更短。
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Let's re-draw this, so it looks a little bit neater, where we have a triple bond in the middle instead, and again, we need our negative 1 charge there.
让我们重写这个，这样看起来更整洁一点，我们有一个三键在中间，同样地，我们这里需要一个负电荷。
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Fellow-Republican Senator Kit Bond of Missouri blasted the president for recent comments in which he stressed the need for an exit strategy from Afghanistan.
VOA: standard.2009.11.23
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What these do is they insure the bond-- they insure the investor against the municipality failing to pay on the bond.
他们的业务是为市政债券保险,他们确保政府当局,有能力向投资者进行赔付
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The Born-Haber cycle was designed to allow us to calculate the energetics of, in particular,the ionic bond.
伯恩哈勃循环,可以让我们计算能量，特别是离子键的。
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I mean, hypothetically a bond trading at $.60 on the dollar with an 8% coupon, five-year bond that's yielding about 18%.
我的意思是，假设一种债券以0。60美元进行交易,同时有8%的票息，五年期债券收益率在18%左右。
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So there's not a lot of room in the government bond market or other high-quality bond markets to generate excess returns.
所以对于政府债券或者优质债券,超额收益的空间不大
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So, we have this security and a ten-year bond would have twenty coupons attached, each with a date on them.
我们持有这样的证券，是十年期的债券,并附有二十张息票，每一个都有日期在上面。
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The way that we can figure this out is using something called bond order, and bond order is equal to 1/2 times the number of bonding electrons, minus the number of anti-bonding electrons.
我们可以用叫做,键序的概念来弄明白它，键序等于1/2乘以成键电子,数目减去反键电子数目。
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So, for example, down here I wrote that it was n 2 and that it was h 2, but when I re-wrote the molecules up here, you saw that it's an h h single bond where it's a nitrogen-nitrogen triple bond.
比如，在这下面我写的是氮分子2,而这个是氢分子，但我在上面把这些分子的形式改写了，大家可以看到,这是一个氢与氢之间的单键，含一个氮与氮之间的三键。
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So, if it's a four-year bond, it would trade at about $90, 6% so it would be yielding 6%.
所以，如果这是四年期的债券，那么它可能在大约90美元左右进行交易，因此它的收益率大约在。
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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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But he said the energy of an X-Y bond is going to be equal to the square root.
但他说ＸＹ键的键能,会等于ＸＸ键与ＹＹ键键能乘积的平方根。
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The yield-to-maturity on an indexed bond is already in real terms because the coupons are indexed to inflation.
这种债券的到期收益率,就是实际收益率,因为票息已经被通胀指数化了
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They want to get as far away from each other possible, the ideal angle is 120. But what we have here is a four-membered ring, so what angle does 90° that have to be, that bond? 90 degrees.
它们想要尽量远离彼此，最理想的是形成120°键角,但现在是个四元环,所以这键角应该多大？
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We can know this information even if we just knew that the bond was stronger, we wouldn't need to look at a graph here, because it turns out that if you have a stronger bond, -- that also means that you have a shorter bond -- those two are correlated.
我们依然可以得到上面的信息,即使我们所知道仅仅是这个键更强，我们不需要去看这个图，因为事实上如果你有一个更强的键，这也就意味着你有一个更短的键-,这两点是互相关联的。
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So let's take a look at what actually happens if we're talking about a carbon-carbon double bond, we're going to have a double bond.
让我们来看一看碳碳双键的情况,例如在乙烷里，我们有个双键。
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As we see a little bit later, I could talk about the carbon-hydrogen bond in methane where there is a plurality of bonds. In this case, there is only the one bond but I just want to get the formulas.
因为我们后来看到一点点，我能讨论甲烷中的碳氢共价键,那有许多共价键，这种情况下，这只有一条共价键,但我想得到氟。
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So, if we talked about a nitrogen-nitrogen single versus double versus triple bond, the triple bond will be the shortest and it will be the strongest.
因此，如果我们讨论的是氮与氮之间的单键,双键与三键，那么三键应该是其中最短的一个，同时也是最强的一个。
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The price of the two-period bond is 1/2 and the price of the one-period bond is 1/.
所以两年期债券的价格是1/^2,一年期债券的价格则是1/
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If I short the one-period bond it cancels out, so I've made no net purchase in 1925.
卖空一单位一年期债券则刚好抵消,所以我在1925年的净买入为零
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So in terms of thinking about ethane, we actually have two bond types that we're going to be describing just in terms of the carbon-carbon bond and then the carbon h bonds.
对于乙烷，我们有两种键,我们继续讨论一下,碳碳键,和碳氢键。
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Is a hydrogen bond shorter, or is a nitrogen-nitrogen triple bond going to be shorter?
是氢的键更短，还是氮与氮的三键更短？
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So if we go ahead and name this bond, what we're going to name it is sigma, - because that's the -- basically the shape of the bond or that's how our bond is coming together.
所以如果我们继续并且命名这一键，就是我们要命名的这个键，因为这是-,基本上键的形状,或者这就是键是怎么到一起的。
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The bond markets,in general, and the high-quality bonds in particular are probably easiest to value.
一般来说,债券市场,尤其是优质债券,可能是最容易定价的
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So for the bond order we want to take 1/2 of the total number of bonding electrons, so that's going to be 4 minus anti-bonding is 4, so we end up getting a bond order that's equal to 0.
键序等于1/2乘以,总的成键电子数，也就是4，减去反键电子数，也就是4。,所以最后得到键序为0。
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This means it is not a strict bond one-to-one.
这意味着不是严格1对1的键。
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Now I want to ask, what's the nature of the carbon-hydrogen bond?
现在我想问问，碳氢键的本质是什么？
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That bond multiple of 72 is just a drag on returns -what's the point?
债券72倍的收益看起来像在拖后腿,为什么还要投资于债券呢
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