It says, if answer, sorry, imagine x is -16, ANS is 0 is less than -16, no. So what does it do?

对不对？让我们来看看，如果答案，对不起0,如果x是-16的话，ANS为0，小于-16吧，对？

麻省理工公开课 - 计算机科学及编程导论课程节选

So, it's the x-y plane, you can see there's no electron density anywhere there.

它在ｘｙ平面，你们可以看到在这里没有电子密度。

麻省理工公开课 - 化学原理课程节选

There is no way that you could irradiate a crystal of nickel with a single beam of x-rays and get that circular ring pattern if the electron beam were behaving as a particle beam only.

没有什么其他的途径,可以让镍晶体发射,单束X光来,继而得到环状图案,如果电子束,是以粒子束形式出现的。

麻省理工公开课 - 固态化学导论课程节选