... cut-off drain 截水排水沟 downstream drain 下游排水 dry stone drain 干砌石排水沟 ...
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downstream drain
下游排水
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Water held in the reservoir, upstream of the city on the River Laver at Birkby Nab farm, will gradually drain away downstream.
BBC: Ripon's ?14.4m flood defence scheme completed
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