Groundwater has very important eco-value in arid and semi-arid regions. 摘要乾旱半乾旱地區地下水具有重要的生態價值。
Aeolian sand, distributed extensively around China?s arid and semi arid zones, is the main bearing body of wind erosion in China. 風成沙廣泛分佈於我國乾旱與半乾旱地區,是我國風蝕與風沙活動的主要載體。