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We can say that a nonpolar molecule you can have as a result of two different conditions.
所以你可以说非极性分子,有两种构成方式。
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So, we know from our calculation that we can do over here, that this bond is polar.
我们通过计算都知道,这个键是非极性的。
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The simile sets out to establish the moral polarities between good and evil, but it then works almost systematically to undo that understanding.
这里的比喻开始创造出善与恶之间的,两极性，然而后来它又几乎自动的抹去了这种理解。
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But in fact, if you just run your fingers again and again over this floppy disk you are disorienting those particles or knocking them off perhaps altogether, depending on the medium.
事实上，如果你把手指一次次的在磁盘上面滑动,这些粒子就会变的无极性,或者把它们整个搞坏，而这取决于媒介。
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Different kinds of polarity form, there's a head, and there's a tail, there's a back, there's a front, there's a left side and there's a right side.
不同的极性开始形成,有头端,也有尾端,有后面,也有前面,有左侧,也有右侧
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Well, if this bond has completely identically equal sharing of electrons, then this bond will be nonpolar.
如果一根键连的两个原子,对键上的电子吸引程度是完全等价的，那么这根键是非极性的。
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So as the particles on the disk that get the current in the read/write head moving put together millions of these magnetized segments and you've got a file.
通过读写头你就可以得到每个粒子的极性,如果把这些上百万粒子的信息,汇聚要一起就够成了一个文件。
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Because this is a dipole, he chose the pole part of dipole to give us polar covalency.
这就是偶极，鲍林选择了偶极中“极“这一部分来,组成极性共价这个词向我们诠释。
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Symmetric disposition of polar bonds still results in a nonpolar molecule.
空间对称的极性键分布,还是会导致整个分子为非极性分子。
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If we can do that, we'll end up with a symmetric nonpolar molecule.
如果我们能这样做，我们就能得到那些对称非极性的分子。
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The second way to have something that is net nonpolar is to have spatially symmetric disposition of polar bonds.
第二种构成,需要空间非极性,就是需要极性键的空间对称分布。
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Nonpolar molecules result from either, it's one or the other.
一个非极性分子，不是这一种就是那一种。
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This is pure covalency. This is polar covalency.
这是平均共价，它是极性共价。
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2 3 So, that means we've got one, two, three, four nonpolar bonds in here.
我们有，4个非极性的键。
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Other polar solids, we will have to come back to that later.
其它的极性固体，我们在后面会讲到这一点。
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Let's show that carbon-hydrogen is polar.
我们把他们的极性表示出来。
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Whereas, H2 is nonpolar.
但是，氢气是非极性的。
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This is homonuclear and so these are nonpolar.
这是同核分子所以是非极性的。
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And so, methane is nonpolar.
甲烷没有极性。
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All of these multiatomic moieties are nonpolar.
这些分子由多原子组成，但都是非极性的。
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And why did he call it polar covalency?
为什么要称它为极性共价呢？
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This bond is polar, but again, as I alluded to earlier, because the carbon is centered in the tetrahedron, because of the sp3 hybridization, the molecule itself is symmetric and nonpolar.
这个键是非极性的，但是，我们断言过早，因为C是中心原子，由于sp3杂化，这个分子本身是非极性的且对称的。
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And, so, what that tells us is HF is polar.
所以这个答案告诉我们HF是极性的。
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The sperm - say this is the one sperm cell that's able to inject its DNA into the egg, well then this cell has a polarity.
假设某个精子细胞,成功向卵子注入了自己的DNA,那这个细胞就有了极性
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Here is the question. Is methane a polar molecule or a nonpolar molecule? Let's look carefully.
问题是，甲烷是一个极性分子还是非极性分子,我们仔细看看。
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We only have the one bond so the actual HF molecule is polar, it has a net dipole.
但HF中只有一根键,所以分子也是极性的而甲烷中有一个网状偶极。
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So you can see that polar covalency is a tendency towards ionic bonding.
所以你看得出极性共价就是,趋向离子键的。
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We know that it's non-polar.
我们都知道他是非极性分子。
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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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And yet, the molecule is symmetric and nonpolar.
所以这个分子是对称非极性的。
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