air ring

• 环形垫,环形空气囊

air ring的用法和样例：

例句

1. It was the idea of supporting a craft on a pad, or cushion, of low- pressure air, ringed with a curtain of higher pressure air.
   这顶计划是将船支承在低压空气垫或低压空气软垫上，低压空气周围围着较高气压空气幔。