Definition
A person or thing that has the potential to unexpectedly alter a situation.
能天天變化局面的人或事物
In the negotiation, he was like the joker in the pack, capable of changing the whole situation at any moment.
在談判中，他就像是牌局中的王牌，隨時可能改變整個局面。
This new technology is a joker in the pack, with the potential to completely disrupt the entire industry.
這項新技術是牌局中的王牌，有可能徹底顛覆整個行業。
Her unpredictable nature makes her the joker in the pack within the team.
她不可預測的性格使她成為團隊中的王牌。