scum

n.

浮渣；泡沫；糟粕；

vi.

产生泡沫；被浮渣覆盖；

vt.

将浮渣去除掉；

过去式：scummed过去分词：scummed现在分词：scumming第三人称单数：scums

1. Don't waste your sympathy on scum like that.
   对这样的渣滓你没必要同情。
2. In the morning you'll be shipped out with the rest of the scum.
   早晨你就会和别的社会渣滓一起运走了。

Scum kicker
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Stable carbon isotope variations in surface bloom scum and subsurface seston among shallow eutrophic lakes
Bio-diesel production by alkali catalyzed transesterification of dairy waste scum