filter bed
South Africa after the end of apartheid
simple past tense and past participle of lampshade
Third-person singular simple present indicative form of interfile
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.
定期点検中、作業員は液体を通して不純物を除去する砂利や砂などからなるろ過層が藻で詰まっているのを見つけ、直ちに清掃が必要だと判断した。
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