双语例句原声例句权威例句
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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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Well, we can do that in rectangular coordinates dz dx dy where dV becomes something like, maybe, dz dx dy, or any permutation of these.
我们在直角坐标系中处理，在这里dV有可能变成，或者它们的其他排列。
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For instance, despite its glass, the 9.7-inch Kindle DX is about 27 percent lighter than the similar sized iPad: The Kindle DX weights 1.1 lbs compared to the iPad’s 1.5 lbs.
例如，即便是玻璃材质，9.7英寸的Kindle DX也比同尺寸的iPad轻约27%：Kindle DX 重1.1磅而iPad重1.5磅。
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So you are supposed to know, for example, if x is t^, you're supposed to know dx/dt is nt^.
接下来你就会知道,例如,如果x=t^,那么dx/dt=nt^
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So, if you're doing physics, x2 work is the integral of force, dx, x1 to x2.
如果你正在干活，功就是力的积分，从x1，到。
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This makes sense; the rate at which the cell population is growing, the derivative dX/dt, is proportional to the number of cells I have.
这个说的通,细胞数目的增长速度,就是导数dX/dt,和细胞数目呈比例关系
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