双语例句原声例句
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So, instead of setting up the integral with bounds and integrating dx dy or dy dx or in polar coordinates, I'm just going to say, well, let's remember the definition of a center of mass.
那么我们将不会建立带上下限的积分，和积分dx, dy, dy, dx或者在极坐标做线积分，需要说，让我们回忆一下质心的定义。
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And, once you have a formula for ndS, that will relate ndS to maybe dx dy, or something else.
一旦有一个ndS的公式，那将会把ndS和dx, dy联系起来，或者其他的一些东西。
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If you end up with a dx, dy, dz in the surface integral, something is seriously wrong.
如果在这个曲面积分中是以dx, dy, dz结尾的，则表明出现了很大的问题。
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You all know that when you do dy/dx, you're not supposed to cancel that d.
你们都知道 当你算dy/dx时,你不能把d约掉
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