shallow gas浅层气shallowadj.浅的；薄的n.浅滩；浅处v.变浅shallow sea measurement positioning浅海测量定位shallow depth hard overlying strata浅埋坚硬覆岩shallow covered large-span tunnel浅埋大跨隧道shallow pattern abdominal retractor浅式腹部牵开器Shallowly experienced and incapable谫陋无能shallow-embedding deep excavation浅埋暗挖shallow seismic S-wave reflection浅层反射横波shallow-buried large-span tunnel浅埋大跨隧道shallow - depth surface excavation浅埋暗挖shallow-covered and bias pressured浅埋偏压