And the last thing we do for any of our structures to check them and figure out are these valid or not valid, are these good Lewis structures is to check the formal charge.

而为了检验任何一个结构是否有效,看它们是不是好的路易斯结构,我们要做的最后一件事就是检查形式电荷。

麻省理工公开课 - 化学原理课程节选

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。

麻省理工公开课 - 化学原理课程节选

For thinkers like Tocqueville for example regimes are embedded in the deep structures of human history that have determined over long centuries the shape of our political institutions and the way we think about them.

举例来说，对于像托克维尔之类的思想家而言,政体内嵌于人类历史的结构深处,许多世纪以来决定了,我们政治机构的形态,及我们对它们的看法。

耶鲁公开课 - 政治哲学导论课程节选

You can see this region here is going to develop into one of the upper limbs, the arms here and the back is different from the front, the spinal cord is developing in the back, whereas, the structures that become our intestinal tract is developing on the other surface.

你能看到这个区域,将会发育成为上肢,这里是手臂,而且身体前后也有不同,脊椎正在后背发育,另外,会成为我们肠管的结构,也在另一个表面发育着

耶鲁公开课 - 生物医学工程探索课程节选

So that's a really important type of an application that we can use MO theory for that we weren't able to do with our Lewis structures.

这是MO理论,在Lewis结构,不能用时的,非常重要的应用。

麻省理工公开课 - 化学原理课程节选

We have two lone pairs, so if we thought about what the bonds were everywhere, 5° it would be 109 . 5, but it's bent because we're only looking at the bonds, we're not counting the Lewis structures in naming our geometry, but they do affect the angles.

我们有两个孤对，所以如果我们考虑它会成怎样的键时，应该成109。,但它是折线型，因为我们只考虑成键，在几何形状里不考虑Lewis结构，但它会影响角度。

麻省理工公开课 - 化学原理课程节选