我能设计一次碰撞，使动能完全转化。
I can arrange a collision so that all kinetic energy has been removed.
他说碰撞真的发生了一次。
他们可能会一次又一次地发生碰撞，直到他们合并。
They will probably collide again and again until they coalesce.
这是一次肮脏的事件，这样的碰撞应该避免的。
It was an ugly incident, that challenge could have been avoided.
这是第一次弄清楚用头碰撞的含义。
This is first time the meaning of the headbutt has been clear.
这是第一次弄清楚用头碰撞的含义。
This is first time the meaning of the headbutt has been clear.
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