OK, if I'm moving in the plane, then position and velocity are in there.
如果在平面上运动，那么位置和速度也会在这个平面上。
The car was moving at such a velocity!
那辆汽车的速度简直太快了！
The regular of the velocity of moving trains has been studied.
调查了铁路列车运行速度的规律。
The regular of the velocity of moving trains has been studied.
调查了铁路列车运行速度的规律。
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