much less would be scattered--

能散射掉的光极少
a single electron wouldn't scatter very much,

一个单电子散射不了多少光
you'd need lots of electrons to scatter a lot,

所以你需要大量的电子来产生足量散射
and they have to be cooperating.

它们需要协同作战
Now you tell me,

现在你们告诉我
why are we interested in electrons scattering light?

为什么我们对电子散射光那么感兴趣
There are just as many protons in a sample as there are electrons.

原子里也有与电子数量相当的质子
Why don't we worry about the protons scattering light?

为什么我们不考虑质子对光的散射呢
Electrons are a lot less massive.

电子要轻得多
Electrons are a lot less massive.

电子的质量小得多
So what?

那又怎样
Prof: So what?

然后呢