ace in the hole meaning in English
（未公开的）王牌
秘密武器
扑克王
杀手锏
正面朝下的王牌
最后的王牌
Examples
- His strength in a crisis is an ace in the hole
临危不惧是他的看家本领。 - The prosecutor had an ace in the hole : an eyewitness
检举人有秘密武器（神秘王牌） ：目击者。 - The terrorists regarded the hostages as their ace in the hole
恐怖分子把那些人质当作他们手中的一张王牌。 - The lawyer ' s ace in the hole was a secret witness who saw the accident
律师的王牌是一位目击此事件的秘密人证。 - He knows something about the boss - that is his ace in the hole
他了解老板的一些事情，那是他应急时要打出的王牌。