And if we do that calculation, what we find out is that the binding energy, in this case where we have no shielding, 72× is negative 8 . 7 2 times 10 to So, let's compare what we've just seen as our two extremes.

我们会发现结合，能在这个情况中，没有屏蔽，等于-8。,所以我们来对比一下,我们在两个极端的案例中看到了什么。

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so it's either, you're at the bottom of the spectrum and you're barely making it,

不管你是哪一个，都是在两个极端，你只能勉强度日，

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