variable-speed metering pump

例句：

1. 1. The variable-speed metering pump is used to control the flow rate of water in a water treatment system.
   可变速计量泵用于控制水处理系统中的水流速率。
2. 2. The variable-speed metering pump is an essential component in the process of water purification.
   可变速计量泵是水净化过程中的一个关键组件。
3. 3.The variable-speed metering pump is designed to provide accurate and consistent flow rates for various applications.
   可变速计量泵设计用于为各种应用提供准确且一致的流量。