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什么是六西格玛Six Sigma？ - 知乎 six sigma 什么是精益六西格玛Lean Six Sigma？ 六西格玛专注于减少过程变异和加强过程控制，而精益则驱除浪费（不增值的过程和程序），促进工作标准化和流程化。
year-old和years old的区别是什么？ - 知乎 例如： My six-year-old son is starting school next week This is a 200-year-old house A 45-year-old woman won the race 英文中类似这种结构的词用来表示形容词的还有很多，比如： Well-known Long-distance Good-looking 1 个回答被折叠 （为什么？ ）