the three-dimensional motion we have cut into three one-dimensional motions.
,我们把三维运动,分解成三个,一维运动。
I have a motion of an object along a straight line we'll call that one-dimensional motion.
假设有一物体，沿直线运动，我们把它称为一维运动。
We know the equations so well from our last lecture from one-dimensional motion with constant acceleration.
上一课的方程我们，已经比较熟了，常数加速度的，一维运动方程。
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