Once you have found the ratio between du dv and dx dy, then it works one way or it works the other way.
你一旦找到了dudv和dxdy之间的比率，它在这个情况下行得通，在相反的情况下行得通。
No one can ever know all there conceivably is to know about the subject, and even the most experienced DX 'ers can never stop trying to learn more.
没有人能真正通晓所有有关于DX的知识，即使是最有经验的DX者也从不停止学习的脚步。
x And, so if we want partial z over partial x, well, so one way is just to say that's going to be the coefficient of dx in here or just to write down the other way.
如果想知道∂z/∂,一种观点认为，它是这里dx前面的系数,或者从别的观点来看。
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