He stopped to watch his son's fruitless efforts.

他停下来看儿子徒劳的努力。

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One minute you might feel very sad, the next minute you may become frustrated with your fruitless efforts, time-wasting and seeing how everybody else seems to find life so easy.

这一刻你也许很难过，下一刻你也许会对你毫无结果的努力、白白浪费的时间和看到别人轻松的生活而倍感挫败。

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But recruiting efforts have been fruitless.

但是招募的努力无果而终。

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In the yard he shook his head, dismissing his fruitless efforts.

NEWYORKER: The Woman of the House

Now, after years of fruitless efforts to deal with taxanes' shortcomings, Bristol-Myers (nyse: BMY - news - people ) and rival Aventis (nyse: AVE - news - people ) (which produces another taxane called docetaxal, under the name Taxotere) each have promising new variations.

FORBES: Taxol's Next Stand

Quarantined populations have been established but efforts to find a cure have been depressingly fruitless.

BBC: Watching Australia's wildlife