英语词汇“pond scum”是什么意思，“pond scum”的读音、用法及例句翻译-烛光网

词汇	pond scum
释义	pond scumn.（名词） Any of various freshwater algae that form a usually greenish film on the surface of stagnant water.绿藻：一种淡水藻，它在死水表面形成一个通常为淡绿色的薄膜
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