n.槽粕；渣滓；卑贱之人
v.形成浮渣；去除浮渣
Don't waste your sympathy on scum like that. 对这样的渣滓你没必要同情。
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。
