Figure 2 illustrates this concept along with the method of data reduction.

图2介绍了这个概念，以及精简数据的方法。

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Data reduction is one of important research issue in rough set theory.

数据约简是粗糙集理论中一个非常重要的研究课题。

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Data reduction is one of important research issue in rough set theory.

数据约简是粗糙集理论中一个非常重要的研究课题。

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