02772282-n 'layer of sand or gravel used to expose sewage effluent to air and the action of microorganisms';
 
汉语 细菌滤床 , 菌膜 过滤层 , 细菌 滤床 , 菌膜过滤层
英语 bacteria bed
Definitions
日语
下水を空気と微生物の活動に晒す砂または土の層
英语
layer of sand or gravel used to expose sewage effluent to air and the action of microorganisms
Relations
Hypernym: filter
Semantic Field: artifactn
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