dross

n. 浮渣，糟粕

droop, droopy, drop, drop by, drop by/in, drop off, drop on, drop out, drop over, drop to one's knees, drop-goal, drop-hammer, drop-forge, drop-press, drop-kick, drop-out, droplet, dropout, dropper, droppings, dropsical, dropsy, drought, drove, drover, drown, drowse, drowsily, drowsiness, drowsy, drubbing, drudge, drudgery, drug, drug addict, drug dealer, drug pusher, drugget, druggist, drugstore, Druid, drum, drum brake,