好的，我要教你们的里一个知识点是，物质能量的相互作用，我们可以见证，巴尔末线系是怎样证实波尔模型的。

All right. The other thing I have to teach you is matter-energy interaction so that we can see how the Balmer series validates the Bohr model.

youdao

攀岩时，你们彼此的确生死与共，你们的命运系在同一根绳子上。这些都是攀岩的魅力。

You are truly with each other, tied together by a piece of rope..., all these wonderful things about climbing.

youdao

你将看到什么——你们将不得不完美地在这里旋即进入，在几个不同的星等的星系间坠落后到我们所看到的太阳系。

What you're going to see — you're going to have to jump in here pretty quickly between several orders of magnitude to get down to where we see the solar system.

youdao

And if you remember this phrase, I don't know why you would, but this will help you learn the lanthanides in order.

如果你能记得这句话的话，我不管你们是怎么做到的，但是这个确实会帮助你按顺序记住镧系元素。

麻省理工公开课 - 固态化学导论课程节选

OK, to work. A word of warning: fasten your seat belts.

好了，开始工作，一些警告的话：,系紧你们的安全带。

麻省理工公开课 - 计算机科学及编程导论课程节选

You don't need to know those, but just because it's a special case with the hydrogen atom, they do tend to be named -- the most important, of course, tends to be the Balmer series because that's what we can actually see being emitted from the hydrogen atom.

你们不需要记住,但因为这是氢原子的特例,人们想要命名它，最重要的是当然是Balmer系,因为它是我们可以看到的,从氢原子放出来的光谱。

麻省理工公开课 - 化学原理课程节选