An ace up one's sleeve

看家本领

Ace是纸牌的么点牌（如红桃A）。玩纸牌的人，不管自己拿到什么牌都会不动声色，等到适当的时机，才亮出袖里的王牌，击败对方。因此，an ace up one's sleeve比喻“看家本领”。1.If Richard does not buy her the ring,Dora still has an ace up her sleeve--tears. 如果理查德不肯给她买戒指，多拉还有一张王牌－－就是她的眼泪。2.The competition is very keen and all the contestants have an ace up their sleeve. 这竞赛十分激烈，所有参赛者都会使出他们的看家本领。