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cofferdam n. 圍堰;潛水箱 圍堰;潛水箱 cofferdam n 1: large watertight chamber used for construction under water [synonym: {caisson}, {pneumatic caisson}, {cofferdam}] Cofferdam \Cof"fer*dam\, n.
A water-tight inclosure, as of piles packed with clay, from which the water is pumped to expose the bottom (of a river, etc.) and permit the laying of foundations, building of piers, etc. [1913 Webster]
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