filter bed

名词 n.
中文释义
英 /ˈfɪltə bɛd/    美 /ˈfɪltɚ ˌbɛd/

英文释义

名词 n.
  1. A layer of gravel, sand, or other material through which liquid is passed in order to remove impurities; also, a pond or tank containing such a layer.

词形变化

filter beds plural
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