短语词组短語steep down grade 陡下坡steep -grade mine 急傾斜鑛井steep p grade 急傾斜culvert on steep grade 陡坡涵洞steep grade mining 陡幫開採sustained steep grade 持續陡坡a steep grade 陡坡long steep grade 長大坡度Hurley Steep Grade T -Shirt 赫利陡坡 返回 steep grade