triple-expansion steam pump

例句：

1. 1.The triple-expansion steam pump is used to pump water from deep underground.
   三膨胀式蒸汽泵用于将水从地下深处抽出来。
2. 2. The triple-expansion steam pump is an essential tool for power plants.
   三膨胀式蒸汽泵是发电厂必不可少的工具。
3. 3. The triple-expansion steam pump is designed to improve the efficiency of oil extraction.
   三膨胀式蒸汽泵被设计用来提高石油开采的效率。