caisson
caisson
[ˈkeɪs(ə)n, kəˈsuːn]
noun
[ˈkeɪs(ə)n, kəˈsuːn]
noun
- a large watertight chamber, open at the bottom, from which the water is kept out by air pressure and in which construction work may be carried out under water
沉箱（底部开口，因有气压而使水无法进入，从而可进行施工的大型防水室）
■a floating vessel or watertight structure used as a gate across the entrance of a dry dock or basin
浮箱式坞门 - (historical)a chest or wagon for holding or conveying ammunition
(史)弹药箱；弹药运输箱
- late 17th cent.: from French, literally large chest', from Italian cassone, the spelling having been altered in French by association with caisse 'case'
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