closed centrifugal pump

例句：

1. 1. The closed-circuit centrifugal pump is used to remove impurities from the water.
   封闭式离心泵用于从水中去除杂质。
2. 2. The closed-circuit centrifugal pump is a popular choice for industrial processes.
   封闭式离心泵是工业过程中的热门选择。
3. 3. The closed-circuit centrifugal pump has been shown to improve water quality in many areas.
   封闭式离心泵已被证明在许多地区提高了水质。