[] () a system that aims to improve production processes so that almost all products are of perfect quality 六西格玛（一种旨在改进生产方法，追求产品零缺陷的质量管理方法）◆Since launching a six sigma quality program the company has saved an estimated ten million dollars. 自从推行六西格玛质量计划以来，公司估计已节省了一千万元。