sludge

n [U] 1 thick greasy mud or substance resembling this 油泥或类似油泥之物: some sludge in the bottom of the tank 桶底的一些淤泥. 2 sewage 污水; 下水道的污物.

slouch hat, slouching, slouchingly, slough, sloven, slovenliness, slovenly, slow, slow down, slow lane, slow motion, slow up, slow-down, slow-witted, slow-worm, slowcoach (Brit) (US `slowpoke), slowdown, slowly, slowness, SLR, slue, slug, sluggard, sluggish, sluggishly, sluggishness, sluice, slum, slumber, slumberer, slumberous, slummy, slump, slung, slunk, slur, slurp, slurry, slush, slush fund,