英语释义
1. extraneous matter or impurities risen to or formed on the surface of a liquid often as a foul filmy covering — compare pond scum sense 2
2. the scoria of metals in a molten state dross
3. a slimy film on a solid or gelatinous object
4. refuse
5. a low, vile, or worthless person or group of people
6. to become covered with or as if with scum
7. a layer of something unpleasant or unwanted that forms on top of a liquid
8. a dishonest, unkind, or unpleasant person
9. a film of matter that rises to the top of a boiling or fermenting liquid
10. a coating (as of algae) on the surface of still water
11. a loathsome person