The water pump is a simple centrifugal pump driven by a belt connected to the crankshaft of the engine. the pump circulates fluid whenever the engine is running.
水泵就是一个简单的离心泵，用皮带连接发动机上的曲轴。发动机无论何时运转水泵都能循环起来。
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Most people know electricity standing still is no more useful than is a stationary belt between a steam engine and a machine to be driven.