So let's look at the chemical potentials.
让我们来看化学势。
Because the chemical potentials have to be equal, right?
因为化学势必须相等，是吗？
That's why I can use the same chemical potentials before and after.
这就是为什么我可以，在开始和结束时都用同一个化学势。
I'll leave till next time the discussion of the chemical potentials.
我把化学式的讨论，留到下节课。
So let's start by writing the chemical potentials being equal to each other.
我们先写下，化学势相等的等式。
So let's start by writing the chemical potentials being equal to each other.
我们先写下，化学势相等的等式。
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