如果你看一下任何时刻运动时的，位置矢量和速度矢量，它们决定了某个平面。

So, if you just look at the position vector, and the velocity vector for any motion at any given time, then together, they determine some plane.

youdao

如果你看一下任何时刻运动时的，位置矢量和速度矢量，它们决定了某个平面。

So, if you just look at the position vector, and the velocity vector for any motion at any given time, then together, they determine some plane.

youdao