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On Monday,Washington,D.C., health officials reported shocking information about H.I.V.
VOA: special.2009.03.20
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And we give different names, depending on what kind of electrons we're dealing with, so, for example, with h c l here, we can talk about having bonded versus lone pair electrons.
我们还起了不同的名字，给我们要处理的不同类型的电子，以氯化氢为例，我们来介绍一下成键电子与孤对电子。
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So, why don't you go ahead and tell me, keeping that in mind, which atom in terms of h c or n would you expect to be in the center of hydrogen cyanide?
那么，请大家来告诉我，并且记住它，你认为氢，碳和氮中哪个原子,应该在氰化氢的中间呢？
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s2 2s2 2p2 We also know that carbon is 1s2, 2s2, 2p2, and we know what hydrogen is.
我们也知道C是，我们也知道H是什么。
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stdio c So somewhere there's standard IO dot C, stdio h somewhere they're standard IO dot H, but, for me, right now, the only file I need to know about is the dot H, -- because what Sharp include really does -- it's what's called a preprocessor directive.
所以某个地方有一个，现在对于我来说它们是，我只要知道那个，h文件，因为Sharp包含的-,叫做预处理指令。
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And if you put this in the well-ventilated area, if you prepare this outside, the h c n gas will actually be released into the air, so you're safe, you can eat it later.
而如果你把它们放在通风良好的地方，在室外处理，那么氰化氢气体,将会被释放到空气中，这样你就安全了，过后就可以吃了。
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So it looks a lot less messy if we just draw our Lewis structure like this for h c n, where we have h bonded to c triple bonded to n, and then a lone pair on the nitrogen there.
这看起来整洁了不少,如果我们把氰化氢的路易斯结构画成这样的话，这样我们就有氢与碳之间的单键和碳与氮之间三键，然后还有一对孤对电子在氮这里。
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So we can figure out the energy of each photon emitted by our UV lamp by saying e is equal to h c over wavelength.
所以我们可以计算出,每个从紫外光源射出的光子,也就是e等于h乘以c除以波长。
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So, the first thing we do is put two electrons between h and c, and then two electrons between c and n.
那么，我们先在氢和碳之间放两个电子，然后在碳和氮之间再放两个电子。
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So we have h c n.
那么我们有氢，碳和氮。
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We somehow have to take hydrogen, attach it to carbon, and we have to make it symmetric, and we have to make it nonpolar.
我们需要把H接到C周围，而且我们需要让它是对称，且非极性的。
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Just the .h file as we'll see is obviously named different than a .c file.
这些头文件是以，h为后缀的，完全不同于,一个，c文件。
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The other thing is that we can re-write our h c n in terms of bonds.
还有一件事是我们可以用键的形式来表示氰化氢。
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And one thing I want to tell you to start out with is something about this c h 3 group here.
有一点需要告诉大家的是,从这个一个碳原子和三个氢原子的组合开始。
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C H 3 So any time you see c h 3 here, remember that that's methyl and that's going to be a terminal group.
因此一旦你看到，记得这就是甲基,而且只能在结构的末端。
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However, we're going to see that that's not the case for hydrogen and carbon.
但是我们发现,将其应用于C和H中。
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So I show that here, so in green, you have what's called a carboxcylic acid group, a c o o h, which gets converted by s o c l 2 to a c double bond o c l or an acid chloride.
我在这里用绿色表示，我们所说的羧酸族化合物，碳，氧，氧，氢，它被亚硫酰氯转化为,一个碳氧双键与碳氯单键组成的酰氯。
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Any time you see a c h 3, this means a methyl group.
一旦你看到一个，C，H，3，的组合，这就意味着一个甲基。
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And I picked looking at methane so we could see if there are other factors that we're not considering, that we need to maybe tweak our model a little bit, and I think we'll find that we do if we take a look at a polyatomic molecule, methane, CH4 so c h 4.
我选择甲烷这个例子，我们可以看到,如果有一些我们没有考虑到的因素，我们需要修改一下我们的模型，我们看一看,甲烷CH4这个多原子分子，就会知道这一点，甲烷。
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