1. geography of arid region 
   干旱区地理
2. erosion of oral mucosa 
   口糜
3. theory of erosion cycle 
   侵蚀轮回学说
4. Desert lands are arid. 
   沙漠地区是草木不生的。
5. The 49 key comprehensive demonstration projects for grassland stockbreeding constructed by the state have made great achievements. By the end of 1994 a total of 5.638 million hectares of artificially sown grass had been completed, which has blazed a new trail for developing animal husbandry and ecological environmental protection in the areas with arid and desertified land and those with serious soil erosion.  
   国家重点组织开展的49个草地牧业综合示范工程取得巨大成效，到1994年底，累计完成人工种草563.8万公顷，为干旱、荒漠、水土流失严重地区发展畜牧业以及生态环境保护开辟了一条新路。

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• 1. 干旱侵蚀
  Ariadnaesporites 刺毛大孢属...arid erosion 干旱侵蚀...arid fan 干旱地区冲积扇
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