摩擦力指的是阻碍运动的一种力。

By friction is meant a force opposing motion.

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这种总是阻碍运动的力我们称之为摩擦力。

This force, which we call friction, always opposes motion.

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惯性是物体对改变其运动状态的力的阻碍。

Inertia is the resistance of objects to efforts to change their state of motion.

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It blocks motor neurons from affecting muscle fibers.

它能阻碍运动神经元对肌肉纤维的支配

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