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have a card up your sleeve

这个表达起源于19世纪。它来自于纸牌游戏。如果一个人想在纸牌游戏中作弊，他可以把一张A或另一张获胜的牌藏在衬衫袖子里。当他需要的时候，他可以把牌从袖子里抽出来，放到手中。随着时间的推移，人们开始将这个短语泛指任何秘密资源，而不仅仅是赌博中的。

to have an advantage that other people do not know about

有锦囊妙计，有一张王牌，留有一招

England have definitely been the weaker side, but I think they've still got one or two cards up their sleeve.

英格兰队无疑处于弱势，不过我觉得他们还有一两张王牌未打出来。

England have definitely been the weaker side,but I think they've still got one or two cards up their sleeve