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1. Oxford American Dictionary

   activated sludge

   • IPA[ˈaktəˌvādid sləj]

   • n.
     aerated sewage containing aerobic microorganisms which help to break it down.

   • noun: activated sludge

2. • 更多解釋

   activated sludge

   • n.
     aerated sewage containing aerobic microorganisms which help to break it down.

   Oxford Dictionary