1. steam ejection vacuum pump 
   水蒸汽喷射真空泵
2. a hand-operated reciprocating pump; used in fighting fires. 
   一种手操作的循环泵；用来灭火。
3. a detachable plate that covers the closed end of a cylinder chamber in a reciprocating engine or pump. 
   覆盖在往复式发电机引擎的汽缸内腔的封闭一端的可分离的盘状物体。
4. A pump without pistons that operates by means of pulsed condensation of steam. 
   气压泵一种通过搏动的压缩蒸汽操作的没有活塞的泵
5. reciprocating piston internal combustion engine 
   往复活塞式内燃机

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• 1. 往复式蒸汽泵
  reciprocating steam engine 往复式蒸汽机; 往复蒸汽机...reciprocating steam pump 往复式蒸汽泵...reciprocating swashplate type engine 往复斜盘式发动机
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