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

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 candidate still has one more trump card to play.
候选人手里还有一张王牌。
I'll play my trump card in the final round.
在最后一局我会出王牌。
This is my trump card. I never use it easily.
这可是我的杀手锏，不轻易使用的！
She could threaten to play her trump card, an autobiography of embarrassing disclosures.
她可能会威胁要拿出她的杀手锏：出自传来爆料糗事。
But China also has a trump card that others don't:$ 3.2 trillion in cash reserves, by far the biggest hoard in the world.
但中国手里握有一张别国不具有的“王牌”：3.2万亿美元的外汇储备，这是全球规模最大的外储。
When we meet again, he tells me that the truth is, if you're a migrant's child, there is little chance you will make it in entertainment or sport. Your only trump card is education.
我们再次见面时，他告诉我，事实是，如果你是移民孩子，你在娱乐界和体育界几乎没有机会，你唯一的王牌就是教育。
His trump card played, captain lmrie rested his case.
在打出了王牌之后，伊姆里船长便静候分晓。
Jobs are the trump card.
就业是一张王牌。
Curviness is the trump card.
但是曲线美才是王牌。