短語詞組短語layered soil strata 土質(zhì)層狀地基silt soil strata 淤泥質(zhì)土層soft soil strata 軟土地層quaternary soil strata 第四紀(jì)土層rock and soil strata 巖土層non -homogeneous soil strata 非均質(zhì)土層 返回 soil strata