trump card

英 [ˈtrʌmp kɑːd]

美 [ˈtrʌmp kɑːrd]

n. 王牌; 绝招; 杀手锏

牛津词典

noun

王牌；绝招；杀手锏
something that gives you an advantage over other people, especially when they do not know what it is and you are able to use it to surprise them

noun

a playing card in the suit that has been declared trumps
1. the ace of trumps is a sure winner
Synonym:trump

This is my trump card. I never use it easily.
这可是我的杀手锏，不轻易使用的！
Nor can we any longer fall back on our historical trump card of geographic isolation.
我们也不再能依靠天然屏障的历史王牌。
Now it's time that you played your trump card.
现在是你摊王牌的时候了。
An unstoppable trump card with enough power to bring order to the world.
一张所向披靡的王牌将命令这个世界。
In the end, the Ten took their appeal to the Supreme Court; this, they had believed from the outset, would be their trump card
最后，10个人上诉到最高法院：他们从一开始就认为这一招是他们的王牌。
The opponent has to play his trump card to secure his third trick.
对方只好打出将牌以赢得第三墩牌。
Curviness is the trump card.
但是曲线美才是王牌。
Jobs are the trump card.
就业是一张王牌。
Not many people know it but shutting up can be the trump card in a lot of situations.
不是每个人都知晓这一点，但沉默在很多场合下的确是最好的王牌。
The US faces special pressures in an election year, but it holds the trump card.
美国在选举年面临特殊压力，但是它手里握着王牌。