deep core

• 深孔

deep core的用法和样例：

例句

1. When drilling deep holes, the feed movement should be released from time to time.
   在钻深孔的时候，有时必须放松进给运动。
2. The new method adopted roof presupporting,deep and medium hole blasting,LHD ore removal and tailings filling.
   该采矿方法采用采场预控顶技术，中深孔爆破，铲运机出矿，尾砂充填。