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biofiltre m
environ.	滴滤池 (一个二级污水处理系统，类似水流的自我净化行为；更准确地说是一个生物氧化床；污水被置于池床里的石头上，水中存在的微生物吸食固体物作为食物。)
tech.	生物过滤装置
water.res.	生物滤池