Atmospheric pressure then pushes the piston back down the cylinder, and if anything (such as a pump) is attached to the piston, some useful work can be done.

于是，气压就会再次将活塞推至汽缸底部。而假如有诸如水泵这样的物体与活塞连接，就可以在活塞的带动下完成一些工作。

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On May 26th BP started to pump heavy drilling mud into the blowout preventer, the set of valves at the top of the well to which that broken pipe is attached.

5月26日，英国石油公司开始将重型钻探泥浆用泵抽运进防喷装置- - - - -它是由多个气阀构成，位于油井顶部，连接着那根已断裂的立管。

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Airship: a giant helium balloon would pump chemicals into the atmosphere via a 23km hose attached to the ground.

一个巨大的氦气球将化学物质通过一个与地面连接的23千米长的软管将化学物质泵到大气层中。

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