1. railway pontoon bridge equipment 
   铁路舟桥器材
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. They had some feather-brained scheme to float a pontoon bridge across the Channel. 
   他们要在英吉利海峡上架一座浮桥，这是一个不太切合实际的计划。

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