(Music) Those were comments from people who took part in the Breast Cancer 3-Day Walk held in Washington,D.C.,last month.

VOA: special.2009.11.02

So that means that if we have three orbitals, we can only have six electrons in those complete three orbitals.

所以那意味着如果我们有3个轨道，我们有且只能有6个电子,在这3个完整的轨道。

麻省理工公开课 - 化学原理课程节选

And there just happens to be a major here which is a kind of an intersection of all those things.

现在有一门专业能够将这3门专业结合在一起。

我的梦想是百万富翁 - SpeakingMax英语口语达人

So, you turned in p-set 3 today, but we'll have the answers posted for you this afternoon, so you can start studying from p-set 3, even as early as tonight, if you want to, because those answers will be there for you.

今天大家应该要交第三次作业了，而我们会在今天下午将答案给大家贴出来，这样大家就可以尽快开始复习第三次作业的内容了，甚至今天晚上就可以开始，如果你需要的话，这些答案将会给你一些帮助。

麻省理工公开课 - 化学原理课程节选

The only people who fail 3.091 are those who choose to fail 3.091.

唯一不能通过这门课的人是,他们自己做出这样的选择。

麻省理工公开课 - 固态化学导论课程节选

So during those years, from 3 to 46, We believed that that part of his brain did not develop in the natural way, because it was deprived of the kind of stimuli to develop in the normal way.

因此，从他3岁到46岁的这些年里，我们认为这部分大脑,没有正常发育，因为没有正常情况下的那些刺激。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

these pentose molecules, whether it's ribose or deoxyribose, the carbons are numbered the same 1', 2', 3', 4', 5', those are the five carbons that make up the pentose.

这些戊糖分子,不管是核糖还是脱氧核糖,碳都是从1'标注到5',也就是构成戊糖的5个碳原子

耶鲁公开课 - 生物医学工程探索课程节选

5 6 1 2 3 So it's 4, 5, 6 comma 1, 2, 3 that are passed into swap and that's why those same numbers end up in A and B. Yeah?

所以这里是,这就是为什么这些数字最终在a和b中，请说？

哈佛公开课 - 计算机科学课程节选

So the 3 s 1, or any of the other electrons that are in the outer-most shell, those are what we call our valence electrons, and those are where all the excitement happens.

它们是经常发生激发情况的,那也是我们所看到，我们称之为价电子，它们是经常发生激发情况的。

麻省理工公开课 - 化学原理课程节选

So, those are our three quantum numbers.

这就是，3个量子数。

麻省理工公开课 - 化学原理课程节选

PROFESSOR: Good. So, it's going to be in 3, because that's the shortest energy difference we can have, 3 those 2 are inversely related, so it must be n equals 3.

教授：好，是3，因为它的能量差最小，红色的是我们能看到的，所以一定是n等于。

麻省理工公开课 - 化学原理课程节选

So I think I can safely say that most people had the right idea and were counting quickly, 3 though I have a feeling that some people who wrote 13 might have forgotten about those 4 f, the 4 f electrons.

我认为我可以放心地说,大部分人的想法都是对的,数得也很快，只是我感觉不少选，13，的人都是因为3,忘了，4，f，4，f，电子。

麻省理工公开课 - 化学原理课程节选

All right, so that's s p 3 hybridization, but those aren't the only type of hybrid orbitals that we can form. Let's take a look at what happens if instead of combining all four orbitals, we just combine three of those orbitals, and what we'll end up with is s p 2 hybridization.

好了，这是sp3杂化，但这并不是我们可以,形成的唯一类型的杂化轨道,让我们来看看，不是四个轨道结合，我们仅仅结合3个轨道。

麻省理工公开课 - 化学原理课程节选

So if we still have an angle of a 109 . 5 degrees, and again, we still have four unpaired electrons available for bonding, we can make one of those bonds with another s p 3 hybridized carbon, so we're going to make up one pair here.

如果键角仍然是109。,同样，我们还有4个未配对的电子可以用来成键，我们可以用其中的一个,和另外一个sp3杂化碳原子成键，这样我们可以组成一对。

麻省理工公开课 - 化学原理课程节选