That turns out to be a very nice way to produce vectors, given one vector, the position vector.

这或许是一个得到矢量的很不错的方法,给你一个位置矢量

耶鲁公开课 - 基础物理课程节选

The most important vector is the position vector that tells you where the object is.

最重要的矢量是位置矢量,用来表示物体的位置

耶鲁公开课 - 基础物理课程节选

That's the analog of the position vector.

那是和位矢相似的情况

耶鲁公开课 - 基础物理课程节选

Even though we started with a single vector, which is the position vector, we're now finding out that its derivative has to be a vector and the derivative of the derivative is also a vector.

即使我们从单个矢量出发,即位移矢量,我们现在也能得出它的导数是矢量,而且导数的导数也是一个矢量

耶鲁公开课 - 基础物理课程节选

I think it's clear, the position of the object with respect to the ground, this vector is the same as the position of the object with respect to the plane, plus the position of the plane with respect to the ground.

我觉得很明显,物体相对于地面的位置,这个矢量等于,物体相对于平面的位置矢量,加上物体相对于地面的位置矢量

耶鲁公开课 - 基础物理课程节选