waste rock

例句：

1. 1. The mine was closed due to the discovery of waste rock.
   由于发现了废石，矿山被关闭了。
2. 2.The company is trying to recycle all its waste rock.
   该公司正试图回收其所有的废石。
3. 3.The engineer studied the geology of the area and found that there were large amounts of waste rock.
   工程师研究了该地区的地质学，发现有大量的废石。