four-stage pump

例句：

1. 1. The four-stage pump is used to increase the pressure of water before it reaches the tap.
   四级泵用于在水到达水龙头之前提高其压力。
2. 2. The four-stage pump is an essential part of the water treatment system.
   四级泵是水处理系统的重要组成部分。
3. 3. The four-stage pump was designed to handle large volumes of water efficiently.
   四级泵被设计来高效处理大量水。