specified life meaning in Chinese

额定寿命
规定寿命
指定寿命

The count of failure includes that of failure classification and failure pattern ; reliability indicator includes mean time to first failure ( mttff ) and mean time between failure ( mtbf ) ; life indicator includes feature life , center life , and specified life
其中，故障统计包括故障类别的统计和故障模式的统计；可靠性指标包括平均首次故障里程mttff和平均故障间隔里程mtbf ；寿命指标包括特征寿命、中位寿命、额定寿命等。