under water pump

例句：

1. 1.The underwater pump is essential for maintaining the cleanliness of the pool.
   水下泵对于保持游泳池的清洁至关重要。
2. 2.The submersible pump is designed to operate in deep water without being damaged by pressure.
   这种潜水泵设计用于在深水中运行，不受压力的影响。
3. 3. The underwater pump is used to remove waste from the aquarium.
   水下泵用于从水族箱中去除废物。