短语词组短语semi -arid sandy area 风沙半干旱类型区cold semi -arid area 寒冷半干旱区hilly semi -arid area 丘陵半干旱区arid semi -arid area 干旱半干旱区northern semi -arid area 北方半干旱地区north semi -arid area 北方半干旱区arid to semi -arid area 干旱 返回 semi-arid area