“废石”造句

随后,他听到她的脚步声离开他, 超过废石砾,渐渐远去.
Then he heard her footsteps go away from him, over the rubble.

低贫化放矿提高出矿品位,降低废石混入.
Low dilution drawing can raise the ore grade of drawing and reduce the mixed waste rock.

• #废石