pontoon

中文： 浮筒

1. A flat-bottomed boat or other floating structure used as a buoyant support for a temporary bridge, dock or landing stage.
2. A bridge with floating supports.
3. A box used to raise a sunken vessel. · Near-synonyms: caisson, camel, sea camel
4. A float of a seaplane.
5. A lighter or barge used for loading or unloading ships.

复数 pontoons