have an ace up one's sleeve

英语新词汇与常用词汇的... ... have all one's buttons 机敏 have an ace up one's sleeve 握着王牌 have an appetite for 爱好 ...

专家希望北极还有最后一张王牌可用（have an ace up one's sleeve），以还北极原来面貌，但就他们所知，方法（means）极 …

... football ace 足球明星,球王 have an ace up one's sleeve v. 握着王牌,有应急的妙计 trump sb.'s ace v. 向某人还击 ...