1. One of several small, auxiliary gasbags placed inside a balloon or a nonrigid airship that can be inflated or deflated during flight to control and maintain shape and buoyancy. 
   辅助气囊置于气球或软式飞艇内的一个小的、辅助性的气囊，可通过在飞行中的充气和放气来控制和保持形状和浮力
2. aircraft supported by its own buoyancy. 
   由自身浮力支持的航空器。
3. To move with lightness and buoyancy. 
   轻快活泼地移动
4. The state or quality of being light; buoyancy. 
   轻重量轻的状态或性质；浮力
5. A nonrigid, buoyant airship. Modern blimps use helium instead of hydrogen to maintain buoyancy. 
   软式小飞艇软式浮飞艇。现代软式小飞艇，利用氦取代氢来保持浮力

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