1 N-PLURAL (国王或女王在重要的正式场合佩戴的)王冠，权杖，珠宝 The Crown Jewels are the crown, sceptre, and other precious objects which are used on important official occasions by the King or Queen. (国王或女王在重要的正式场合佩戴的)王冠，权杖，珠宝
2 N-COUNT [usually poss NOUN] 最重要(或最有价值)的东西 If you describe something as someone's crown jewel, you mean it is the most important or valuable thing they have. 最重要(或最有价值)的东西
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The company is also willing to sell 20% of its crown jewel, its credit-card business.
该公司还愿意出让其20%的核心业务，即信用卡业务。