| 词汇 | pontoon |
| 词源 | pontoon. The Greek god of the sea, Pontus, gives his name to the pontoon bridge, a floating structure, as well as to the pon- toons on seaplanes and the pontoon lifeboat, a lifeboat depend- ent for buoyancy on a watertight double bottom. Pontoon is first recorded in 1591. |
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