Most of electricity comes from water power plants. 大部分电力是由水力发电厂生产的。
By impeding the flow of a river, a hydroelectric dam converts kinetic energy into gravitational potential energy stored in the form of a deep lake. 水力发电厂的水坝藉由拦阻河水的流动，将动能转变为重力位能，并以深水湖的形式储存下来。
