A good example of this is found in the kinetic molecular theory, in which gases are pictured as being made up of many small particles that are in constant motion.

分子运动理论便是我们能找到的一个很好的例子。在这个理论中，气体被描绘成由许多不断运动的小颗粒组成。

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A good example of this is found in the kinetic molecular theory, in which gases are pictured as being made up of many small particles that are in constant motion.

分子运动理论便是我们能找到的一个很好的例子。在这个理论中，气体被描绘成由许多不断运动的小颗粒组成。

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