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fool’s errand

noun
🔊/ˌfuːlz ˈerənd/
🔊/ˌfuːlz ˈerənd/
 [singular]
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  1. a task that has no hope of being done successfully徒劳无益的差事
    • He sent me on a fool's errand.他派我去干白费力的事。🔊🔊
    Topics Difficulty and failurec2