pitcher pump

例句：

1. 1. The pitcher pump is used to control the flow of liquids.
   投球泵用于控制液体的流动。
2. 2. The pitcher pump was designed to improve the efficiency of the process.
   投球泵的设计是为了提高过程的效率。
3. 3. The pitcher pump was used to dispense the liquid in a controlled manner.
   投球泵被用来以可控的方式分配液体。