d regions造句

• The space-time distribution of chinese semi-ari d region surface water is n't even, the differences in a year are obvious; the differences of underground water between years are not so obvious as surface water, but it still has a decreasing tendency, especially in shanxi and sha'anxi provinces . there is a significant linear correlation between the precipitation and water resources in semi-arid region, the dynamic regularity of water resources is basically same as the dynamic regularity of precipitation
  半干旱地區地表水資源時空分布不均勻，年內分配差別大，地下水資源年際間變化率不大，但總體有減少的趨勢，尤以陜西和山西突出。半干旱地區降水量與水資源量線性相關顯著，降水量的變化規律基本上與水資源量的變化規律吻合。
• It's difficult to find d regions in a sentence. 用d regions造句挺難的