so we got high electron density.

所以电子密度很高
But that one, the nucleus was not in this plane,

而对于这个原子没有经过其原子核
so you just got a little glancing blow at it.

得到就是一些边缘的信息
But you could draw these things on acetate or plastic sheets

你可以把这些图画在透明的纸上
and stack them up, right?

再叠起来就行了
This was the model made for the first determination of structure of penicillin

这是第一张关于盘尼西林的轮廓图
in fact, the potassium salt of penicillin.

严格来说是盘尼西林的钾盐
Where's the potassium atom?

钾原子在哪
How can you distinguish potassium

怎么知道是钾原子
from nitrogen or carbon or hydrogen or oxygen?

而不是氮碳氧?
Electron density.

电子密度
It'll have a lot more electron density.

钾原子电子密度更高