Cofferdam: Watertight enclosure from which water is pumped to expose the Bed of a Body of water in order to permit the construction of a pier or other hydraulic work.
围堰：防水围护堤，将堤内的水抽尽，露出水底以便建造桥墩或其它水工结构。
Cofferdam: Watertight enclosure from which water is pumped to expose the Bed of a Body of water in order to permit the construction of a pier or other hydraulic work.
围堰：防水围护堤，将堤内的水抽尽，露出水底以便建造桥墩或其它水工结构。
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