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单词 pond scum
释义

WordReference Random House Unabridged Dictionary of American English © 2024
pond scum′, 
  1. Microbiologyany free-floating freshwater alga that forms a green scum on water.
  • 1885–90

Collins Concise English Dictionary © HarperCollins Publishers::
pond scum n
  1. a greenish layer floating on the surface of stagnant waters, consisting of various freshwater algae
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更新时间:2025/7/23 14:04:37