So when an electron jumps up or down, it absorbs or emits a very specific color of light.

所以当一个电子往上或往跳下时，它会吸收或发出一种特定颜色的光。

And then if that electron jumps off, what happens to sodium?

然后如果电子跳下来，钠会发生什么？

You'd have billions and trillions of these atoms rolling around, and these electrons jump off, then they go to one, then they jump to another.

你会有数十亿和数万亿个这样的原子在滚动，这些电子跳出来，然后它们去一个，然后它们跳到另一个。

But for the sake of our purposes, let's say we just have these two atoms. And what you have is that that electron jumps off.

但是为了我们的目的，假设我们只有这两个原子。你所拥有的是那个电子跳跃。

So when an electron jumps down a step in a hydrogen atom, it emits a different energy, a different color of light, than an electron jumping down in a helium or calcium atom.

所以当一个电子在氢原子中跳下来时，它就会释放出与从氦原子或钙原子中跳下来时不同能量、不同颜色的光。