So, we want to decompose the position vector into a sum of simpler vectors.

故我们是把位置向量，分解为简单向量的和。

youdao

We have the cross-product of the position vector to this point times the force.

我们用这个点的，位置向量，乘以这个力。

youdao

So, the velocity vector is the derivative of a position vector with respect to time.

速度向量，是位置向量关于时间的导数。

youdao

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

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