The impact of rainfall upon the surface water and groundwaterresources of the desert is greatly influenced by landforms.
降雨对于沙漠地表水和地下水资源的影响很大程度上取决于地形。
2
Such programs are much needed because in many arid lands there is only a vague idea of the extent of groundwaterresources.
这样的计划是非常必要的，因为在许多干旱地区，我们并不清楚其地下水资源的范围。
3
The United Nations Environment Programme and the World Bank have funded attempts to survey the groundwaterresources of arid lands and to develop appropriate extraction techniques.