plunger pressure

例句：

1. 1.The plunger of the pump is designed to pressurize the fluid.
   泵的活塞设计用来增压流体。
2. 2. The plunger was used to push the button, but it didn't work as expected.
   活塞被用来推动按钮，但并没有如预期那样工作。
3. 3. The plunger has a small hole in the center that allows air to escape.
   活塞中心有一个小孔，允许空气逸出。