numero uno /ˈnuːmərəʊ ˌuːnəʊ/

• 1.  

  ADJ（形容词） Numero uno means better, more important, or more popular than anything else or anyone else of its kind. 头等的 [非正式]

  例：

  The company's chief operating officer was the numero-uno fund-raiser for the event.

  该公司的首席运营官曾是这个活动的最佳募捐者。