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。

youdao

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。

youdao

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。

youdao

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^

耶鲁公开课 - 基础物理课程节选

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。

麻省理工公开课 - 热力学与动力学课程节选

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

耶鲁公开课 - 生物医学工程探索课程节选

Those with DX-format lenses will also be happy to know that these lenses can also be used on the camera as well as the ability to set DX crop for stills or video to extend the reach of telephoto or telephoto zoom lenses.

ENGADGET: Nikon unveils lightweight, full-frame D600 DSLR -- hands-on and low-light samples (video)

The folks at DataXu last week launched a brand advertising equivalent DX Brand.

FORBES: Ditching the TV Ad and Taking the Google Road to Brand Promotion

The real flurry over the new DX, though, has to do with the fate of newspapers.

NEWYORKER: A New Page