每种运动都需要一根长棍。
切断后，该神经根至其肌肉效应器的躯体运动神经支配被中断了。
When transected, the somatic motor innervation of this specific spinal root to its effector muscles remains interrupted.
一根手指的弹击足够使一个气球加速离去，当气球运动时，一点动力，甚至空气的摩擦力可以很快使它慢下来。
The flick of a finger is enough to make a balloon accelerate away. When moving, it has little momentum and even the friction of the air quickly slows it up.
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