manual pumping unit

例句：

1. 1.The manual pumping unit is essential for maintaining the water level in the reservoir.
   手动泵机组对于保持水库水位至关重要。
2. 2.The manual pumping unit was designed to be easy to use and maintain.
   手动泵机组设计得易于使用和维护。
3. 3. The manual pumping unit is used to transfer fluids from one location to another.
   手动泵机组用于将流体从一个地点转移到另一个地点。