pump piston

例句：

1. 1. The pump piston is the part that moves up anddown to push water through the pipes.
   泵活塞是推动水通过管道上下移动的部分。
2. 2.The engineer had to replace the pump piston after it broke during testing.
   工程师在测试中不得不更换泵活塞。
3. 3. The pump piston was designed to be easy to cleanand maintain, which made it a popularchoice for industrial applications.
   泵活塞设计易于清洁和维护，这使得它在工业应用中非常受欢迎。