| 单词 | an ace in the hole |
| 释义 | an ace in the hole (US) or chiefly British an ace up your sleeve ◊ If you have an ace in the hole or an ace up your sleeve, you have a powerful and often secret weapon, advantage, etc., that you can use if it is needed.秘藏的王牌；秘密武器 The mayor's popularity among elderly voters gives him an ace in the hole for the coming election.市长深得老年选民的喜爱，这是他应对即将到来的选举的一张王牌。 ace |
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