So we are going to have solids and we are going to have crystal.

因此我们得到固体,同时我们也将得到晶体。

麻省理工公开课 - 固态化学导论课程节选

And, before you know it, you have crystal.

接下来，就得到了晶体。

麻省理工公开课 - 固态化学导论课程节选

And what that corresponds to, if you recall, is the idea that in a perfect crystal at zero degrees Kelvin then you have no disorder at all.

如果你们能回忆起来的的话，这就意味着,绝对零度下的完美晶体,一点无序状态也没有。

麻省理工公开课 - 热力学与动力学课程节选

that's one way to think about it, and there's also another way, and this is the way that your book presents it. If you, in fact, have two of the same atom right next to each other, let's say you have a crystal, or let's say you're talking about a metal, what you can do is just look at the distance between the two nuclei, and split that in 1/2, and take the atomic radius that way.

这只是一种定义的思路，另外还有其它方法，也就是你们课本上的方法，如果你，事实上，有两个相同的原子彼此靠在一起，比如说你有一个晶体，或者说你讨论的是一个金属，你所要做的就是,看看这两个原子核之间的距离，然后将距离除以二，就得到了这个原子的半径。

麻省理工公开课 - 化学原理课程节选

I know table salt is white, but that is because you have power and you have multiple surfaces scattering, but a large crystal of sodium chloride is clear and colorless.

我知道食用盐是白色的，但这是因为你让它成了粉末,因为有了多个散射面，但是一个大的氯化钠晶体,是无色透明的。

麻省理工公开课 - 固态化学导论课程节选