英语词汇“sand filter trenches”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	sand filter trenches
释义	sand filter trenches sand filter trenches A system of trenches, consisting of perforated pipe or drain tile surrounded by clean, coarse aggregate containing an intermediate layer of sand as filtering material and provided with an underdrain for carrying off the filtered sewage.
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