词典释义：
释义
〈英〉必要时才公开的计划（或优势）；锦囊妙计。
双语例句
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Bill always has a card up one's sleeve, so whenever faced up with a puzzle, he could find a way.
比尔总有锦囊妙计，所以任何时候遇到难题，他总能找到办法解决。