短語(yǔ)詞組短語(yǔ)bed form roughness 底床糙度bed d roughness 層粗糙度river bed roughness 河床糙率bed d form roughness 底床糙度Sudden change in bed roughness 粗糙度突變Artifical Roughness Bed Stilling Basin 加糙消力池 返回 bed roughness