...间（Time of Failure: TF），对产品而言，针对其工作使用环境（Operation），所找出的TF，即为其使用期限（Operation Life Time）。其方法为：AF = exp [?
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For some time after his dangerous operation, Keren's life hang by a thread.
在手术后的一段时间，凯伦的生命都处于垂危之中。
One time arrives personally the scene training, artillerys fault operation makes him to be injured seriously, the life is critically ill.
一次亲临现场练兵，炮兵的失误操作令他严重受伤，生命垂危。
Besides, an expensive operation only prolongs its life for a short time.
除此之外，昂贵的手术医疗费，仅可以维持牠的生命非常之短暂。
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