impeller of pump

例句：

1. 1. The impeller is responsible for turning the liquid in the pump.
   叶轮负责将泵内的液体转动。
2. 2. The impeller is made of stainless steel and has a diameter of 20 cm.
   叶轮由不锈钢制成，直径为20厘米。
3. 3.The impeller is designed to increase the efficiency of the pump.
   叶轮设计用于提高泵的效率。