areas where no data 无资料地区
Gray indicates areas with no data.
灰色地区表明无分布数据。
In many karstic mountainous areas where there are no groundwater observation data available, water resources evaluation is conducted mainly dependent on karst hydrological method.
许多无地下水观测资料的岩溶山区，其水资源评价主要靠岩溶水文学方法。
Rough Set Theory is a new mathematical approach to uncertain and vague data analysis. It is, no doubt, one of the most challenging areas of modern computer applications.
作为处理不确定和含糊问题的新的数学方法，粗糙集理论对于现代计算机应用，无疑是最具挑战性的领域之一。
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