fool's errand
noun [ C ] uk/ˌfuːlz ˈer.ənd/ us/ˌfuːlz ˈer.ənd/
徒劳无功的努力
an effort that is unlikely to be successful
It's a fool's errand trying to get Lena to join in anything. 想拉蕾娜参加什么活动根本就是徒劳。
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