短语词组短语semi arid loess hill region 半干旱黄土丘陵区loess hill -gully region 黄土丘陵沟壑loess hill and gully region 黄土丘陵区Junger loess hill -gully region 准格尔黄土丘陵沟壑区loess hill semi -arid region 黄土丘陵半干旱区 返回 loess hill region