1N-PLURAL (國王或女王在重要的正式場合佩戴的)王冠,權杖,珠寶The Crown Jewels are the crown, sceptre, and other precious objects which are used on important official occasions by the King or Queen. (國王或女王在重要的正式場合佩戴的)王冠,權杖,珠寶
2N-COUNT [usually poss NOUN]最重要(或最有價值)的東西 If you describe something as someone's crown jewel, you mean it is the most important or valuable thing they have. 最重要(或最有價值)的東西
The company is also willing to sell 20% of its crown jewel, its credit-card business.