Most people who want to get ahead spend useful time writing personal notes of gratitude, sympathy and congratulations.

大多数想获得成功的人都利用有用的时间来写表示感谢、慰问和祝贺的私人信函。

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The reliability of GM counter tubes should be described by useful time before failure life and failure rate during life.

GM计数管的可靠性应当以失效的工作时间-寿命，以及在寿命期间的失效率来表征。

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Then proposes three ways to enhance the security of 802.1X like adopt EAP-TLS, add status confirmation and set useful time for certification.

提出通过采用EAP-TLS 交互认证协议，增加状态确认和设置认证有效时间三种方法提高802.1X 认证的安全性。

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But the kind of exercise we did last time is a useful exercise for those of you who are Econ majors.

但是我们上节课做的练习,对经济学专业的同学是非常有用的

耶鲁公开课 - 博弈论课程节选

So you can scroll back through your history, which is also useful for time's sake.

所以我们可以滚回到我们的历史记录，这个可以节约我们的时间。

哈佛公开课 - 计算机科学课程节选

We'll talk a little bit about the principles of cellular physiology and then I'll move next time to talking about how you culture cells outside of the body and what that's useful for.

这节课我们讲一些,细胞生理学的一些原理,下节课具体讲,体外培养细胞的方法,及其用途

耶鲁公开课 - 生物医学工程探索课程节选

They've rearranged the narrative by starting with Jane's heartsick flight from Thornfield Hall, by spending useful time on her usually scanted encounter with St.

WSJ: Jane Eyre, Mars Needs Moms and Red Riding Hood | Film Reviews by Joe Morgenstern

But the basic point of the FT article still stands: the PPI scandal might be bad for the banks' reputation, and their balance sheets, but it is now putting money in people's pockets at a very useful time.

BBC: A welcome boost - unless you're a bank

In either case, Facebook becomes less useful over time.

FORBES: Google+: A Full-Court Press on Facebook