短語詞組短語overlying g strata 表層;覆層;上覆地層overlying rock strata 上覆巖層overlying disrupted strata by extraction 採動覆巖overlying rock strata in stope 採場上覆巖層overlying strata movement 覆巖移動overlying strata failure 覆巖破壞grout into overlying strata 覆巖注漿movement of overlying strata 上覆巖層運動mining overlying strata 採動覆巖 返回 overlying strata