gravelyadv.严肃地;庄重地;严重地;沉重地
graveln.碎石v.铺碎石;使困惑
gravel and sand bed卵石夹沙河床
gravel retainer cup砾石承托碗
gravel filled layer填砾层
gravelly coarse sand砾质粗砂
gravel packing block砾石填料
gravel washing plant洗砾机,砾石洗涤设备
gravel retainer plug砾石承托塞
gravel pebble mixture砂砾卵石混合料
gravel pervious layer砂砾石透水层
gravelling by two ash二灰碎石