作为语言手段的一种，它主要体现为“不独立性与独立性的统一”、“差异性与相似性的统一”、“客观性与主观性的统一”三大特色。
As a means of language, it mainly shows three features: the unity of dependence and independence, the unity of disparity and similarity, the unity of objectivity and subjectivity.
现有不同评价体系在设计原理、指标构成、数据处理与权重分配方面具有差异性，但评价结果具有相似性。
The exiting systems have the similar results but differ on the principles, index, data processed and weight distribution.
聚类通过比较数据的相似性和差异性，能发现数据的内在特征及分布规律，从而获得对数据更深刻的理解与认识。
By contrasting the similarity and dissimilarity in data, clustering can find out the data's inner characteristic and distribution rule, so we can obtain the further understanding.
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