of the force in the x direction.
若只在y方向移动。
The motion is only in the x-axis, along the x direction.
只在x轴，沿着x轴的方向进行移动。
So, the direction of the force is going to be that of x, y, z.
所以方向是。
For velocity in the x, y, or z direction.
对于x，y，或z三个方向的速度。
For velocity in the x, y, or z direction.
对于x，y，或z三个方向的速度。
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