You take one very large mirror and hang it to form an arm, then hang two more mirrors perpendicular to it to form an L-shape.

想象一下，你有一块很大的镜子，把它作为一条边，然后用另外两块镜子与它垂直放置作为另一条边。

youdao

If you use the -l option with ls, you will get a file listing that contains a wealth of information about the files being listed. Here's an example.

如果你在使用ls命令的时候永乐- l选项，那么，你就会得到显示的关于一个文件的很多信息。

youdao

In the first column of output, you see the first character is an 'l' (lower-case l) for symbolic links.

在输出的第一列中，您可以看到，符号链接的第一个字符是‘l’(小写l)。

youdao

So, first, if I point out when l equals 0, when we have an s orbital, what you see is that angular part of the wave function is equal to a constant.

首先，如果ｌ等于０,那就是ｓ轨道，你们可以看到,它波函数的角度部分是一个常数。

麻省理工公开课 - 化学原理课程节选

And if you've typed in l when you should've 1 typed a 1, or a 1 when you should've typed an l, you're likely to miss it. If you've made a mistake with upper and lower case. Things like that. So just be very careful looking at that.

如果你本来想打，1，的时候,却输成了，l，或者打，l，的时候输成了，你很可能注意不到这个错误,如果你把大小写弄混了也是一样,要注意这个错误。

麻省理工公开课 - 计算机科学及编程导论课程节选

And what you can see is that 0 for any n that has an l equals 0, you can see here how there's only one possibility for and orbital description, and that's why we don't need to include the m m when we're talking about and s orbital.

你们可以看到,对于任何n，如果l等于，你们从这里可以看到，只有，一种,可能的轨道描述，所以,当讨论s轨道的时候,不需要考虑。

麻省理工公开课 - 化学原理课程节选

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