短語詞組短語subgrade engineering 路基工程subgrade conditions 地基現(xiàn)狀subgrade protection 路基防護(hù)subgrade settlement 路基沉降;路基下沉subgrade slip 路基滑動special subgrade 特殊路基subgrade erosion 路基沖刷subgrade construction 路基工程 返回 subgrade