短語(yǔ)詞組短語(yǔ)underground work excavation 地下開(kāi)挖工程underground powerhouse excavation 地下廠房開(kāi)挖underground engineering excavation 地下工程開(kāi)挖underground excavation engineering 井巷工程underground excavation engineering project 地下洞室工程shallow underground excavation method 淺埋暗挖法underground excavation cluster 地下洞室群shallow underground excavation 淺埋洞室;淺埋暗挖shallow cover underground excavation 淺埋暗挖法 返回 underground excavation