黄土的结构性
structural behavior of loess
半干旱黄土丘陵沟壑区
semiarid Loss Hilly and Gully
semiarid loess hilly-gully regions
半干旱黄土丘陵区
Semiarid loess hilly and gully region
Semiarid loess hilly region
semi-arid Loess Hill Region
semi-arid loess hill area
semiarid hilly area of the Loess Plateau
半干旱黄土区
semi-arid loess hilly and gully region
semiarid loess area
semi-arid loess area
半湿润黄土丘陵区
semi-humid rolling loess region