sludge

中文： 污泥

1. Solids separated from suspension in a liquid. (countable, uncountable)
2. A residual semi-solid material left from industrial, water treatment, or wastewater treatment processes. (countable, uncountable)
3. A sediment of accumulated minerals in a steam boiler. (countable, uncountable)
4. A mass of small pieces of ice on the surface of a water body. (countable, uncountable)
5. Institutional policies that introduce tedium and inefficiency in processes. (countable, uncountable)

复数 sludges