当原子想动的时候，它们就互相碰撞。
When the atoms try to move, they vibrate against each other.
微型行星会慢慢互相碰撞而增加重量。
The "planetesimals" would slowly collide with each other and become more massive.
船在暴风雨中互相碰撞。
The boats were buffeted against one another during the storm.
船在暴风雨中互相碰撞。
The boats were buffeted against one another during the storm.
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