Definition
The most significant advantage or most powerful resource one possesses, especially when used to gain an edge over others.
王牌，撒手锏
In negotiations, his best card is to maintain a calm and patient demeanor.
在谈判中，他最好的牌是保持冷静和耐心的态度。
Her trump card is her vast experience and expertise.
她的王牌是她丰富的经验和专业知识。
The company claimed their innovative technology was their trump card to outperform their competitors.
该公司声称他们的创新技术是他们超越竞争对手的王牌。