pumping of group wells

例句：

1. 1. The pump is used to inject water into the pipelines.
   这个泵用来将水注入管道。
2. 2.The engineer was tasked with circulating the oil through the system.
   工程师被指派了通过系统循环油的任务。
3. 3.The pressure pump was designed to pressurize the air for the aircraft engine.
   压力泵被设计用来为飞机引擎加压空气。