黄土公路隧道
loess road tunnel
loess highway tunnel
Highway Tunnel in Loess Area
黄土及软岩公路隧道
Loess and Weak Rock highway Tunnel
黄土软岩公路隧道
loess and soft surrounding rock road tunnel
黄土路堑边坡
slopes nearby the loess cutting
loess cut slope
湿软黄土路基
wettest-soft loess subgrade
高速公路路域土壤
Soil of highway road area
高等级公路路面抗滑石料
highway pavement stone sliding
高速公路公司
expressway administration company with limited liability
freeway business group