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1·The jerky motion of electric current may be described by three-order Lagrange equation.

三阶拉格朗日方程可以用来描述电流猝变运动。

2·Fast motion, like a tennis serve, is no longer jerky.

像网球发球这样的快动作画面，再也不会忽动忽停了。

3·The staccato motion is never sudden or jerky;

断奏动作从不突然的或急切的；