n.

worthless people

同義詞：trash

a film of impurities or vegetation that can form on the surface of a liquid

Blue‐green algal scums: An explanation for their occurrence during freshwater blooms1
Purification of sludges, scums, and the like to prepare relatively purified tocopherol
Factors affecting the timing of surface scums and epilimnetic blooms o...
Factors affecting the timing of surface scums and epilimnetic blooms of blue-green algae in a eutrophic lake
Microprofiles of photosynthesis and oxygen concentration in Microcystis sp. scums
Microprofiles of photosynthesis and oxygen concentration in Microcystis sp. scums
The potential role of particulate diatom exudates in forming nuisance mucilaginous scums.
Environmental factors affecting the production of peptide toxins in floating scums of the cyanobacterium Microcystis aeruginosa in a...
Chromophoric dissolved organic matter of black waters in a highly eutrophic Chinese lake: Freshly produced from algal scums?
An algorithm for detecting trophic status (chlorophyll- a ), cyanobacterial-dominance, surface scums and floating vegetation in inla...