The first two platform previews demonstrated hardware acceleration of text, images, and vector graphics.

前两个平台预览版本说明了文本、图像和矢量图形的硬件加速。

youdao

So, the definition will take effect. The acceleration is as a vector, and the acceleration vector is just the derivative of a velocity vector.

有必要对加速度给出一个严格的定义，加速度,作为一个矢量,是速度的一阶导数。

youdao

This acceleration that is necessary to make the change in the velocity vector is always pointing towards the center of the circle.

要促使速度矢量，产生如此的变化，所需的加速度，总是指向圆心。

youdao

You can take a derivative of the derivative and you can get the acceleration vector, will be d^2r over dt^2, and you can also write it as dv over dt.

你可以对导数再求一次导,你就可以得到加速度矢量,也就是 d^2 r / dt^2,你也可以写成 dv / dt

耶鲁公开课 - 基础物理课程节选