By friction is meant a force opposing motion.
摩擦力指的是阻碍运动的一种力。
This force, which we call friction, always opposes motion.
这种总是阻碍运动的力我们称之为摩擦力。
Finally, the total friction force of the PSS is measured.
最后，对系统的摩擦力进行了测试。
The friction force is each meshing point cut off resistance.
摩擦力就是各个啮合点被剪断时的阻力。
The friction force is each meshing point cut off resistance.
摩擦力就是各个啮合点被剪断时的阻力。
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