The appearance of six sigma management theory puts forward new ideas to solve this problem.

而六西格玛管理理论的出现，为解决这一问题提出了新的思路。

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Then Six Sigma quality theory is a statistically based quality management system. Its essence is to continuously reduce variance and pursue higher quality.

而六西格玛理论是一套建立在统计学基础上的质量管理系统模式，它的本质是不断减少偏差，持续追求高品质。

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