scum

n 1 [U] layer of froth on the surface of a boiling liquid; layer of dirt on a pond or other area of still water （煮沸的液体表面的）泡沫; （池塘或其他静止水面上的）浮垢, 浮渣. 2 [pl v] (fig derog 比喻, 贬) people considered to be bad or contemptible 一群坏人或卑贱的人: You scum! 你们这群坏蛋! * She treats smokers like the scum of the earth, ie as the worst people there are. 她把吸烟的人都当作败类. * I wouldn't have anything to do with those scum. 我才不跟那些无耻之徒来往呢.

scruple, scrupulous, scrupulously, scrutable, scrutineer, scrutinize, scrutinize, scrutinise, scrutiny, scuba, scud, scuff, scuff (also `scuff-mark), scuffle, scull, scullery, scullion, sculpt, sculptor, sculptural, sculpture, scummy, scupper, scurf, scurfy, scurrility, scurrilous, scurrilously, scurrilousness, scurry, scurvily, scurvy, scut, scutter, scuttle, Scylla, scythe, SDLP, SDP, SE, sea,