英语词汇“filter bed”是什么意思，“filter bed”的读音、用法及例句翻译-烛光网

词汇	filter bed
释义	filter bedn.（名词） A layer of sand or gravel on the bottom of a reservoir or tank, used to filter water or sewage.滤垫：在蓄水池或大容器底部铺的一层沙或砾石，用于过滤水或污水
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