All right, last time we talked exclusively about completely inelastic collisions.
好，上节课，我们只讲了，完全非弹性碰撞。
It is important to realize that momentum conservation applies even to inelastic collisions, in which the kinetic energy is not conserved.
必须记住，动量守恒甚至对于非弹性碰撞也是成立的，尽管这时动能已不守恒。
Inelastic collisions among photoelectrons rapidly distribute their initially gained energy throughout the region of ionized gas.
光电子之间的非弹性碰撞使它们原来获得的能量在整个电离气体中迅速分配。
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