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日本东北部，被地震和海啸摧毁的南三陆町市。人们在一个加油站边运行一个脚踩曲轴泵给汽车加油。
Men operating a bicycle crank pump refuel cars at the site of a gas station in the earthquake- and tsunami-destroyed town of Minamisanriku, northeastern Japan. (AP Photo/David Guttenfelder)
往复泵的活塞由连杆曲轴与原动机相连。原动机可用电机，亦可用蒸汽机。
Reciprocating piston pump crankshaft by connecting rods connected with the original motivation. Prime mover can be motor, steam engine can also be used.
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。
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.
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