pneumatic component

例句：

1. 1.The airbags in the car are pneumatic.
   汽车中的气囊是气动的。
2. 2. The pneumatic tire is designed to reduce rolling resistance.
   这种充气轮胎设计来减少滚动阻力。
3. 3.The pneumatic tube was used to deliver messages quickly.
   这种充气管被用来快速传递信息。