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The incident severely strained the bond between Turkey and Israel, which until recently had enjoyed relatively warm relations.
VOA: standard.2010.06.10
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And we find the same thing for these two atoms here, it's not actually a double bond, it's somewhere between a single bond and a double bond.
而且我们发现这两个原子的情况是一样的，它其实不是一个双键，而是介于单键与双键之间的。
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He introduced the concept of electronegativity which was a measure, therefore, it is quantitative, of the atom's ability to attract electrons within a covalent bond and developed a scale of electronegativity.
他引入了电负性这一概念,一个反映着原子在成共价键时吸引电子的能力的数据标度，因此这是数量上的，在共价电子中,电子原子能吸引电子,并发展为一定规模的电负性。
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That shared interest between Ankara and Tehran may be ultimately the strongest bond between these two neighbors.
VOA: standard.2010.07.26
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It's a 1 and 1/2 because it's halfway between a double bond and a single bond.
是因为它介于,单键和双键中间。
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She says the bond between service dogs and their handlers makes the animals uniquely qualified to deal with PTSD symptoms, including dissociative episodes, or flashbacks.
VOA: standard.2010.05.18
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Well, in '26, the-- i've shorted the one-period bond and so I have to pay out one dollar, but that's exactly what I wanted to do.
6年 我卖空的一年期债券到期了,我需要偿还一美元,不过这恰是我要做的
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He stressed the bond between the United States and Haiti is strong.
VOA: standard.2010.01.13
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Socrates, in other words, has broken the bond of tradition and traditional authority that holds the ancient city and the ancient family together.
苏格拉底，其实已经摧毁了,传统与传统权威间的联系,那可是维系古代城邦,与古代家庭的力量。
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Gambling, tuxedos, and Bond, James Bond.
VOA: standard.other
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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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So there's electron density above the bond and below the bond.
所以在键轴上面和下面都有电荷密度。
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r1 is the yield on the one-period bond and r2 is the yield on the two-period bond.
1是一年期债券的收益率,r2则是两年期债券的收益率
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He said that the percent ionic character, and this is within a bond, not for a compound, for a covalent bond.
他提到离子百分数，是指一根键中，并非一个分子中。
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OK, then it says draw a single bond from each surrounding atom to the central atom, and subtract two valence electrons.
后将中心原子与其相邻原子之间,连上单键，然后减掉2个价电子。
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And you would find that the bond energy of the heteronuclear molecule was nowhere on the average of the two.
你将发现,电子相同的分子的总能量,并不是平分的。
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So, if we take a look at what a single bond is, and let me grab some molecules here.
如果来我们看一下单键，让我拿个分子。
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In contrast, if we talk about a double bond, what we're now talking about is having both a sigma bond and also one pi bond. And I apologize, I intended to set this up right before class, but that didn't happen today.
相反，如果我们讨论一个双键，我们现在讨论的是,一个sigma键和π键，抱歉，我应该在课前就把这个装好的，今天没装好。
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In contrast, the dissociation energy of a bond for hydrogen, and molecular hydrogen is everywhere around us, we see 432 kilojoules per mole.
相反，氢分子在我们周围到处都是，一个氢分子的离解能，是432千焦每摩尔。
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And if we put that in our bond here, we have 1, 2, 3 bonds, plus we have one lone pair left over.
如果我们把它们放到键里，我们有1，2，3个键，还剩下一对孤对在这里。
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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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And to do this we're going to introduce valence bond theory, and the idea of hybridization of orbitals.
在这之前我们要引入价电子成键理论，和杂化轨道的概念。
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All right, so let's think of a more complicated example of having a double bond, and maybe a more interesting example, and this is talking about benzene.
好了，让我们来看关于双键的,一个更复杂的例子，也许是更有趣的例子，我们要讨论苯环。
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And we can also talk about the bond length, so we might be interested in what the bond length is, what the distance between these two nuclei are.
另外一点就是键长，我们对键的长度也感兴趣，也就是两个原子核之间的距离。
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And the bond order you get out will either be, for example, zero, which would mean that you have no bond, 5 or you could have 1, a single bond, 1 . 5, a 1 and 1/2 bond, 2, a double bond, and so on.
你得到的键序要么是比如说是零，这意味着没有键，或者你会得到1，单键1。,1又二分之一键，2，一个双键，等等等等。
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This energy level diagram helps us understand the relationship between electron filling and bond strength.
能级图能帮助我们,理解电子填充,和键强的关系。
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The ability of an atom to attract electrons, and in particular, in a covalent bond.
原子对电子的吸引能力，特别是在共价键中。
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And a sigma bond forms any time you have two orbitals coming together and interacting on that internuclear axis.
当你把两个轨道合在一起,并在核间轴上有相互作用时,就形成了sigma键。
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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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