修理的产品repaireditem不修理的产品non-repaireditem服务service规定功能requiredfunction时刻instantoftime时间区间timeinterval持续时间timeduration累积时间accumulatedtime量度measure工作operation修改(对产品而言)modification(ofanitem)效能effectiveness固有能力capability耐久性durability可靠性reliability维修性maintainability维修保障性maintenancesupportperformance可用性availability可信性dependability失效failure致命失效criticalfailure非致命失效non-criticalfailure误用失效misusefailure误操作失效mishandlingfailure弱质失效weaknessfailure设计失效designfailure制造失效manufacturefailure老化失效;耗损失效ageingfailure;wear-outfailure突然失效suddenfailure渐变失效;漂移失效gradualfailure;driftfailure灾变失效catalepticfailure关联失效relevantfailure非关联失效non-relevantfailure独立失效primaryfailure从属失效secondaryfailure失效原因failurecause失效机理failuremechanism系统性失效;重复性失效systematicfailure;reproduciblefailure完全失效completefailure退化失效degradationfailure部分失效part