simplex-duplex pump

例句：

1. 1. The simplex-duplex pump is used for both water and wastewater treatment.
   单工双工泵被用于水处理和废水处理。
2. 2. The duplex pump has two separate pipes for each direction of flow, making it more efficient.
   双工泵有两条独立的管道，分别用于水流的正反方向，使其更加高效。
3. 3. In the industrial process, the simplex-duplex pump is often used to control the flow rate of liquids.
   在工业过程中，单工双工泵经常被用来控制液体的流量。