pneumatic stirring process

例句：

1. 1. The car is powered by apneumatic engine.
   这辆车由一个气动引擎驱动。
2. 2. The aircraft uses pneumatic brakes for its landinggear.
   这架飞机使用气动刹车来降落其起落架。
3. 3. The pneumatic tire has a high inflation pressure.
   这种充气轮胎具有很高的气压。