He stopped to watch his son's fruitless efforts.

他停下来看儿子徒劳的努力。

youdao

But recruiting efforts have been fruitless.

但是招募的努力无果而终。

youdao

If you want to get into this field but your efforts have proved fruitless, look no further. This unofficial guide will set you on the straight path to employment.

假如你有此意向却尚未如愿，不妨参考以下的非官方指南，它将使你在求职的道路上一往无前。

youdao

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