n. scum
... screw 螺旋桨 scum 浮垢 sealed container 密闭容器 ...
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浮垢条纹 scum line
悬浮固体物积垢 suspended solid fouling
污垢悬浮能力 soil suspending power
·2,447,543篇论文数据，部分数据来源于NoteExpress
从池塘的浮垢到河床上的水芹和沼泽地上随风摇摆的芦苇，这些淡水藻类和植物为生物提供呼吸的氧气和可吃的食物。
From scum on ponds to water celery on river beds and reeds swaying in a wetland breeze, freshwater algae and plants provide oxygen to breathe and food to eat.
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