单词	layer of scum
释义	layer of scum 浮碴层
随便看	straight row straight rubber compound straight rule straight ruler straight-rum asphalt straightrun straight run straight-run straightrun asphalt straight run asphalt straight-run asphalt straight-run asphalt cement Straight run asphalt cement WESTBANK straightrun bitumen straight run bitumen straight-run bitumen straight run chick straightrun clear gasoline straight run clear gasoline straight-run clear gasoline straight-run coal tar pitch straight run cold rubber straight-run diesel straight-run diesel caustic scrubbing straightrun diesel distillate