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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As with all dead things, holding onto it won't keep it alive or change the fact that it's useful time has come and gone.

死了的东西，坚持下去不会让它复活，或者改变它有用的时间已经来了并且过去了的事实。

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If these are all examples of attempts to convert "down time" into useful time, take note of the way in which "down time" has been expanded.

如果这都是将“无用时间”转化为有用的例子，就得注意“无用时间”是怎么被扩展的。

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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