pumping action

例句：

1. 1. The pumping action of the engine is essential for maintaining proper fluid pressure.
   发动机的泵送动作对于保持适当的流体压力至关重要。
2. 2. During the pumping action, the liquid is forced through a tube and out into the surrounding environment.
   在泵送过程中，液体被通过一个管子并排出到周围的环境。
3. 3. The pumping action helps to remove waste from the system and prevent contamination.
   泵送动作有助于从系统中去除废物并防止污染。