But, if you look more carefully, you will find that this is a blend of three different forms of carbon.

但是，如果你们再认真一点，会发现,它是三种形式的碳的混合物。

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You've got a little of this, a little of this, a little of this, and it makes up whatever it is that you end up with, the particular recipe for that liquid.

混一点这种威士忌,再混一点另一种,再换一种混,最终得到了混合威士忌,这种饮品有独有的配方

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So, using those, now, what happens if we take the second derivative of A, the mixed derivative, partial with respect to T and the partial with respect to V.

如果我取A的二阶导数,混合导数，对T偏微分,再对V偏微分。

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