片语
Critical Excavation Depth临界开挖深度
digging depth挖掘深度
excavation depth of each step每步开挖深度
excavation calculative depth开挖计算深度
limit excavation depth极限开挖深度
shallow-depth-excavation tunnel浅埋暗挖隧道
excavation depth of dam foundation坝基开挖深度
shallow-depth surface excavation浅埋暗挖