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So what we want to do, is, I guess another way of saying it is, efficiency is really about choice of algorithm.
因此我们想做的就是，换种说法，效率实际上是算法的选择，我们想要培养你们。
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So let's do a quick clicker question, and you tell me how many valence electrons does fluorine have? Remember, valence electrons are different from core, they're only the outer-most electrons in the outer-most shell.
那么让我们来做一个小选择题，请大家来告诉我,氟有多少个价电子，要记得，价电子与芯电子不同，它们是在最外壳层的最靠外面的电子。
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Sometimes, Mill agrees, we might succumb to the temptation to do the latter, to be couch potatoes.
穆勒同意，我们有时会无法抵挡后者的诱惑,选择后者，做沙发土豆。
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What we're going to have to do is try to decide between them.
我们要做的是选择其中之一
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So what we do is we pick an origin, call it zero, we put some markers there to measure distance, and we say this guy is sitting at 1,2,3,4,5.
我们现在选择一个原点,称其为零点,我们做一些标记来测量距离,这个点在五个单位长度的地方
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Think of that, that where the law is silent, we have the freedom to do or not to do as we choose, very important to the way we think of liberty today in a modern and you might say liberal democracy.
仔细想想，在法律所认可的地方，我们可按自己的选择去做或是不做，这对身在现代自由民主时代的我们,思考何为自由至关重要。
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So, let's make sure everyone kind of has this down, let's do another clicker question here.
好，让我们确保每个人都记下了这点，来做下一个选择题吧。
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So, these are the different ways that we can actually go ahead and use formal charge when we're choosing between different types of Lewis structures.
那么，这些就是在我们需要在,不同的路易斯结构之间做选择的时候,我们如何用形式电荷来进行判断的各种方法。
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We're actually going to do one more clicker question to get started with today, and as we do, I'll explain something we're going to be trying today, which is a little bit of a friendly competition in terms of answering the clicker questions correctly.
我们将在开始讲授今天的课程之前,再多做一个选择题，我先来说明一下做这件事的原因，这实际上是一个,回答选择题的小比赛。
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So, let's do a clicker question on isoelectronic atoms.
那么，让我们来做一个关于等电子原子的选择题吧。
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So let's go to a clicker question.
那么让我们来做一个选择题。
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