未知背景的灰色体系的定量分析通常需要二维数据。
The two-way data is usually necessary for the quantitative analysis of the gray system.
分析城市交通环境空气影响因素，设计一套评价指标体系，并建立了环境大气质量评价的灰色决策模型。
Elements which influence the urban traffic air, we design a index system and construct the grey decision model to assess the Quality of the air.
本文通过对在线拍卖网站进行分析，建立了在线拍卖网站评价指标体系，提出了一种基于粗糙集的在线拍卖网站灰色评价方法。
By analysis of online auction website, index system of online auction website evaluation is established, and an evaluation method of online auction website based on rough sets is put forward.
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