短语词组短语arid slope land 旱坡地semi arid sandy land 半干旱沙地arid sandy land 干旱沙地arid mountainous land 干旱山地arid area land use 干旱区arid desert land 干旱沙漠土地Semi -arid-land 西北半干旱地区Arid Land Studies 干旱区研究 返回 arid land