rock under-excavation 岩石地下工程
existed tunnle right under excavation 基坑工程下的已建隧道
But is the veil of mystery hanging over Skellig Michael, where excavation and conservation have been under way since 1978, even thicker than necessary?
但是我们真的需要知道那么多笼罩在斯凯利格·迈克尔岛上的谜团吗（对该遗址的考古发掘和保护工程从1978年就开始了，直到今天）？ --------------------------这句，好像不是说真的需要的意思吧？
In June 2009, illegal underground excavation for a parking garage in Shanghai caused the 13-story building under way next to it to simply fall over.
2009年6月，因非法开凿地下车库，导致临近它的一栋13层建筑物整体倾倒。
The excavation of long shaft under high dip Angle and large diameter has a big difficulty and a high risk.
陡倾角、大直径、长斜井开挖施工难度大、危险程度高。
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