prove futile;beat the air;be a wasted effort;burn daylight;be a fool for one's pains ;

I wanted to sort out this problem with him, but it was like banging my head against a brick wall.
我曾想跟他把这个问题给解决了,但结果徒劳无功。
来源:《柯林斯高阶英汉双解学习词典》The crew fought a losing battle to try to restart the engines.
全体船员努力尝试重新启动发动机,但结果徒劳无功。
来源:《柯林斯高阶英汉双解学习词典》The British establishment seems to be off on another quest for fool's gold.
这家英国机构似乎开始了又一次徒劳无功的探索。
来源:《柯林斯高阶英汉双解学习词典》Efforts to reach the people named in the report proved unavailing.
联系过报告中所提到的那些人,但都徒劳无功。
来源:《柯林斯高阶英汉双解学习词典》After months of futile labor , the scientist suddenly had a brainstorm and solved the problem.
数月努力,徒劳无功, 科学家突发奇想,问题迎刃而解.
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