Sludge
01
the semi-solid residue produced during sewage or wastewater treatment
例
The treatment plant removes sludge from the water before discharge.
Engineers studied the composition of the sludge to improve filtration.
02
any heavy, soft, wet, and often sticky material
例
Mudslides left a layer of sludge over the road.
The machine 's filter was clogged with sludge.
