Only an actual motion can convert a potential motion into an actual motion.
当潜在运动（动因）变成实际运动（实动），即为运动。
In many example of mechanical motion, there is an interchange between kinetic and potential energies.
在很多机械运动的实例中，有一种是动能和势能之间的相互转化。
It is merely a transformation of potential energy into energy of motion.
这仅仅是位能转换为动能而已。
It is merely a transformation of potential energy into energy of motion.
这仅仅是位能转换为动能而已。
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