Rough Set is a new mathematical tool to deal with fuzzy and uncertain knowledge. It has strong knowledge obtaining ability.

粗糙集理论是一种处理模糊和不精确知识的数学工具，它具有很强的知识获取能力。

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Rough set theory is a new mathematical tool to deal with vagueness and Uncertainty problem after probability theory, fuzzy sets, mathematical theory of evidence.

粗糙集理论是继概率论、模糊集、证据理论之后的又一个处理不确定性问题的新型数学工具。

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The main steps of fuzzy synthetic evaluation are as follows: (1) make certain factor aggregation.

模糊综合评估按照以下步骤进行：1、确定评价因素集；

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