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A model fort is the only structure in the park built in the exact place as the first building.
VOA: special.2009.08.17
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So in terms of remaining valence electrons we have 12, so we can finish off each of our Lewis structures, so that's our first structure there, and our second structure there.
那么关于剩下的价电子，我们有十二个，因此我们可以完成这两个路易斯结构了，那么这是我们的第一个结构，而那是我们的第二个结构。
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So in our first structure, we would find for the nitrogen we have a formal charge 5 minus 4 minus 2, because we're starting with 5 valence electrons, so that is a formal charge of minus 1.
那么在我们的第一个结构中，我们发现氮的形式电荷量是五减去四4,再减去二，因为我们开始有五个价电子，因此它的形式电荷量是负一。
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Well, first of all, let's look at the Lewis structure.
好，首先，我们看看它的路易斯结构。
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Demos The first political structure is the demos.
第一个是。
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And I would suggest to you that the consumption of home is driven by a certain kind of desire as well, that desire to move up in the American class structure: "the first electric refrigerator in my family."
而我的看法是对家的消耗,也是由一种特定的渴望驱动的，这种渴望上升到美国的阶级结构：,“我们家的第一台电冰箱“
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Consider the structure of the first three chapters.
并考虑,前三章的结构。
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That's what I want to do for the first few minutes of the lecture here is tell you a little bit about the details of the structure and how molecules fit into this image of DNA that's already very familiar to you.
这是我想要,在这节课最初几分钟告诉你们的,有关DNA结构的一些细节,DNA分子结构与这个卡通模型如此一致,对你们来说很熟悉
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So in terms of the first step of skeletal structure, this is actually going to be easier because we don't have a central atom, we just have carbon and nitrogen here.
对于第一步画出骨架，其实比刚才更容易,因为我们没有一个中心原子，我们这里只有碳和氮两个原子。
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And in terms of thinking about it for organic chemistry or if you're interested in thinking about the mechanism maybe by which it is toxic, a first step would be to draw its Lewis structure.
而为了在有机化学中思考它,或者如果你对它,有毒的机理感兴趣的话，第一步要做的应该就是画出它的路易斯结构。
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So, how do we figure out first how to draw the skeletal structure of this molecule here?
那么，我们如何来解决它,首先是如何画出这个分子的骨架结构？
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the first step in any Lewis structure is drawing the skeletal structure.
画任何路易斯结构第一步,都是先画出它的骨架。
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