Shaft formation by long-hole blasting

• 深孔爆破成井

Shaft formation by long-hole blasting的用法和样例：

例句

1. This paper briefly intro-duced the practice of longhole blast shaft-formirg method for blind shaft sinking in Tongshan Copper Mine.
   本文简要介绍了深孔爆破成井法在铜山铜矿盲竖井掘进中的实践。