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

Curviness is the trump card.
但是曲线美才是王牌。
The candidate still has one more trump card to play.
候选人手里还有一张王牌。
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。
Spatial sound reproduction, the loudspeaker's trump card ever since, is noticeably more three dimensional and offers a much larger spatial image.
音场表现是这对喇叭的王牌，它可以营造出一个更加立体的三度空间音场，空间感也更为广阔。
Now it's time that you played your trump card.
现在是你摊王牌的时候了。
'What's her trump card?
什么是她的王牌呀？
Jack showed his trump card at the last minute.
杰克在最后一刻打出了王牌。
His other trump card is his financial independence.
韩寒的另外一张王牌就是他的经济独立性。
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。
This is my trump card. I never use it easily.
这可是我的杀手锏，不轻易使用的！