He sent me on a fool's errand .

他派我去干白费力的事。

《牛津高阶英汉双解词典》

I'm afraid you're going on a fool's errand.

我恐怕你会枉费心机.

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I went for an interview yesterday, but a fool's errand. The job had already been filled.

我昨天去应徵工作, 可是白费工夫,因为已经有人录取了.

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Many believed this was a fool's errand.

许多人认为这是徒劳的.

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It was a fool's errand and there wasn't any gold to be found.

这是徒劳的工作,根本找不到黄金.

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Even in quiet times, predicting the paths of exchange rates is a fool's errand.

即便是在正常时期, 判断汇率走势也是愚蠢的举动.

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