shallow gas浅层气
shallowadj.浅的;薄的n.浅滩;浅处v.变浅
shallow-embedding-deep-excavating method浅埋暗挖
shallow-buried and lateral pressure tunneling浅埋软弱偏压
shallow-depth and dissymmetrical loading tunnel浅埋偏压
shallow-buried large-span double-arch tunneli浅埋大跨双连拱隧道