In everyday solids, liquids and gases, heat or thermal energy arises from the motion of atoms and molecules as they zing around and bounce off each other.
我们日常的固体、液体和气体，它们的热量和热能是从原子和分子在它们到处活泼跳跃和相互碰撞、弹开而上升。
Atoms join together to form gases, liquids and solids.
原子聚合起来，形成气体、液体和固体。
Solids expand and contract as liquids and gases do.
固体像液体和气体一样也会膨胀和收缩。
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