middle--deep blasting hole

• 深孔爆破

middle--deep blasting hole的用法和样例：

例句

1. Large-diameter longhole blasting was used to excavate soil-rock in some engineering project.
   某工程的土石方开挖采用大直径深孔爆破方式。
2. The blasting technique of vertically parallel and dense bunch longhole is a new ore breaking technology.
   垂直平行密集束状深孔爆破技术是一种新的崩矿技术。