He knows something about the boss, which is his ace in the hole.
他对老板有所了解，这是他的王牌。
That spare can of gas in the trunk was our ace in the hole.
后背箱里那罐剩余的汽油是我们最后的储备。
The lawyer's ace in the hole was a secret witness who had seen the accident.
那律师手中的一张王牌是目睹那次变乱的一个机密证人。
The lawyer's ace in the hole was a secret witness who had seen the accident.
那律师手中的一张王牌是目睹那次变乱的一个机密证人。
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