在第一个例子里，我们看到的是sigma键。

So in this first case here, what we're seeing is a sigma bond.

youdao

在第一个例子里，“非常好的机会”是什么意思？

In the first example, exactly what does an excellent chance mean?

youdao

现在我们对它们进行求和，使用reduce，正如我们在第一个例子中所做的。

Now we total them up using reduce, just as we did in the first example.

youdao

Okay. That's another example. And the last one I'll give you is on 55.

好的，我再给出最后一个例子，在第55页。

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In the first example, you could be at a social gathering and you really feel the need for some nicotine.

在第一个例子中，你可能在一个社交聚会上，你特别想找个地方抽根烟。

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So if we have total +2 and complete shielding -1 where that can actually negate a full positive charge, because remember our nucleus is plus 2, +1 one of the electrons is minus 1, so if it totally blocks it, all we would have left from the nucleus is an effective charge of plus 1.

抵消一个完全的正电荷,因为记住我们的原子核是,其中一个电子是,所以如果它完全挡住了它，我们从原子核中留下的，全部有效电荷就是，所以，在我们的第一个例子中,我们的第一种极端情况。

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