通过最小化系统的致命失效概率，可得出在系统资源备份一定时的最佳指令重试时间。
By minimizing the fatal failure probability, the optimal instruction-retry time can be obtained under the condition that the resource backup is set.
由于船体的可靠性高且样本少，在船体的可靠性试验中常用定时截尾方法得到船体寿命的无失效数据。
Because of the high reliability of hull and less samples, the fixed time censoring method is used in the reliability test of hull commonly to get zero-failure data of hull.
可以标记这些信息本身在一定时间之后失效，也可以标记这些信息在一定的时间内被激活。
The messages themselves can be tagged to expire in the database after a certain amount of time or tagged to be activated within a certain time period.
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