cof·fer·dam /-ˌdæm/
圍堰;潛水箱
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.
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cofferdam
n : large watertight chamber used for construction under water
[syn: caisson, pneumatic caisson]