ex-cavation of underground cavern

• 地下洞室开挖

ex-cavation of underground cavern的用法和样例：

例句

1. This paper approaches the excavating dynamic behavlour and support design for a large cavern in Nanfen Iron Mine using finite element method.
   针对南芬铁矿地下硐室开挖与支护设计，采用有限元分析研究大跨度地下硐室施工的动态力学效应。