pneumatic knockout

例句：

1. 1.The car is pneumatic tires.
   这辆车是充气轮胎。
2. 2. The balloon was filled with helium and then inflated.
   这个气球用氦气填充并充气了。
3. 3.The airbags are pneumatic to provide protection during a crash.
   气囊是充气的，以在碰撞时提供保护。