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

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。
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。
But the real disappointment for Yahoo shareholders is that the company threw away its trump card so cheaply.
但真正令雅虎股东失望的是，雅虎如此轻易地丢掉了自己的王牌。
Don't reveal your trump card before the crucial moment.
不到紧急关头不要亮出撒手锏。
This is my trump card. I never use it easily.
这可是我的杀手锏，不轻易使用的！
Henry is the trump card of France.
亨利是法国队中的皇牌。
I'll play my trump card in the final round.
在最后一局我会出王牌。
Jack showed his trump card at the last minute.
杰克在最后一刻打出了王牌。
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。
Proximity to America, Mexico's trump card, has been made more valuable by the high oil price.
邻近美国是墨西哥的王牌，这使得高油价更有价值。