1. hydraulic and oil press 
   液压机
2. A group of apprentices were operating the hydraulic press. 
   一群学徒工在操作水压机。
3. Hydraulic pump is the power unit of the hydraulic puller(hudraulis press, hydraulic pipe bender, hydraulic jack). 
   油压泵是油压拉出器(油压机,油压弯管机,油压千斤顶)的动力装置.
4. To form(metal) by a mechanical or hydraulic press. 
   锻制通过机械或水的压力锻制
5. The plunger or piston of a force pump or hydraulic press. 
   活塞压力泵或水压机内的柱塞或活塞

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