And I want you to get used to this, that colon is important, it identifies the start, and then the set of indented things identify all the things at the same level, and when we reset back to the previous level, that's when we go back to where we were.

我希望大家熟悉这个结构，冒号很重要，它定义了开始的地方，然后缩进号代表着,同样一层的对象，当我们到了，不缩进的地方的时候，也就到了以前的状态。

麻省理工公开课 - 计算机科学及编程导论课程节选

And, likewise, we get over to here and finally, look, here is 5d and 5f almost at the same level.

照这样，我们分析到最后，看，5d和5f层几乎是在同一层。

麻省理工公开课 - 固态化学导论课程节选

I'm doing a test there to say, x if the string x is less than the value of b, and x does not appear before b as strings, then I was going to do, oh, a couple of things, because they're at the same block level.

我正在做一个测试来看看，字符串,是不是小于b的值，而且x不在b之前作为字符串出现，如果是真的话我就要做，一系列的操作，因为他们是在同一个块等级上。

麻省理工公开课 - 计算机科学及编程导论课程节选

We cannot have two 1s's sitting at the same level.

我们不能是两个1s电子同时在一个能级上。

麻省理工公开课 - 固态化学导论课程节选