A cache that expires too often can result in unnecessary performance degradation; therefore cache lifetime values are also important to tune.

太频繁过期的缓存会导致不必要的性能下降；因此，优化缓存生存期值也是非常重要的。

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They are also a function of a peculiar labour market with lifetime employment, a wage system based on seniority rather than performance, and little job mobility among managers.

同时这种薪酬制度也有助于维护该国特有的讲究论资排辈和缺乏流动性的终身雇佣制为基础的劳动力市场。

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Relatively low levels of exposure can reduce their IQ scores, cause learning disabilities, poor school performance, and violent behaviour, all of which may contribute to reduced lifetime earnings.

较低量接触可降低其智商评分，引起学习障碍、学习成绩不良以及暴力行为，所有这些可促使终生减少收入。

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Of course,many who witnessed Elvis at the International still remember him giving the performance of a lifetime.

VOA: standard.2010.04.30

To test his mettle, he signed on as a trainer at Performance of a Lifetime, an organizational development firm started by two sometimes actors.

WSJ: A Broadway Performer Helps Make Business an Act of Will

And the New York Post trumpets, All hail the great Helen Mirren, who delivers the performance of a lifetime in Frears' witty, touching and engrossing film.

NPR: Summary Judgment: 'The Departed,' 'Employee of the Month,' 'The Queen'

All of this begs a question: Is it really fair to basically lock in most of a players' lifetime income based on his performance as a college senior and his draft position?

FORBES: Sports Business