短語詞組短語excavation calculative depth 開挖計(jì)算深度limit excavation depth 極限開挖深度Critical Excavation Depth 臨界開挖深度excavation depth of dam foundation 壩基開挖深度excavation depth of each step 每步開挖深度shallow -depth-excavation tunnel 淺埋暗挖隧道 返回 excavation depth