Clustering analysis is an important approach of data mining, and an important content of human activity.

聚类分析是数据挖掘的重要方法之一，也是人类活动的一个重要内容。

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The problem solution is a basic human learning activity, and students process of problem solution is a major approach to obtain knowledge.

问题解决能力差是导致学生学业不良的主要原因，培养学生分析和解决问题的能力是中学物理教学的主要目标之一。

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