rock drill steel

例句：

1. 1. The engineer used a rock drill to bore through the solid rock.
   工程师用岩石钻机钻穿了坚硬的岩石。
2. 2. The construction crew was using a rock drill steel to remove the old concrete.
   建筑工人正在使用岩石钻头钢来拆除旧混凝土。
3. 3. The rock drill steel is essential for drilling through hard rock formations.
   岩石钻头钢对于钻穿硬岩层至关重要。