what three quantum numbers tell us, versus what the fourth quantum number can fill in for us in terms of information.

三个量子数和,四个量子数告诉我们的信息。

麻省理工公开课 - 化学原理课程节选

And then, for the next piece of information, I am going to go to postulate number five.

接下来，我要讲假设五。

麻省理工公开课 - 固态化学导论课程节选

So, today we're going to introduce the chemistry topics, which we will cover in 5.111, and give you general information, practical information about the course number of points you need, when the exams are, that kind of thing, policies, and introduce you to the teaching staff.

今天，我们将向你们介绍这门课会涉及的化学问题，并告诉你们一些基本信息和实用信息，像你需要的课程分数,考试时间，课程政策，以及授课教师。

麻省理工公开课 - 化学原理课程节选

But notice what this does. The first thing it does is, it says, let's check and make sure x is greater than or equal to 0. If it isn't, notice what's going to happen. None of that block is going to get executed, and it's going to come down here and print out a useful piece of information, which says, hey, you gave me a negative number. I don't know how to do this.

做的是和以前一样的事情,但是注释它做了什么，第一件做的事情就是,程序说，要去检查并且确信x是大于等于0的，如果不是的话，请注意会发生什么,下面的代码都不会被执行,程序会到这里来然后显示一些有用的信息,信息会说，嘿，你给了我一个负数,我不知道该怎么弄这个了。

麻省理工公开课 - 计算机科学及编程导论课程节选