The first way is just to turn the crank on the math, and the second way is to do a little bit more imaginative about the process.

第一个方法就是纯数学推导,第二个方法我们将对,这个过程做一些物理图像的想象。

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Again, don't worry too much about the equation, we're not really going to do any math here, I'm just putting it in for completeness.

对这个方程也不需要太深究,在这里我们不强调数学运算的,我把它写出来是为了表述完整

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