an ace up your sleeve

更新日期：2026-08-14

词语	an ace up your sleeve
释义	an ace up your ˈsleeve(BrE)(NAmEan ace in the ˈhole)(informal)a secret advantage, for example a piece of information or a skill, that you are ready to use if you need to秘藏的王牌；应急的妙计；锦囊妙计
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