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由于美国大坝老化,工程业主和经营者在进水口闸门的排水和更换方面遇到了难题,而大型进水口则为一项专门的问题,要求工程师们提出新颖的排水方案。
Due to the aging of the American dams, project owners and operators encountered difficulties in draining and replacing the water inlet gates, while the large water intakes were a special issue requiring engineers to propose novel drainage schemes.