informal <非正式>
1
- oneself自己：
you must look after number one.
你必须照顾好自己。
2
- a person or thing that is the most important in an activity or area头号人物; 头等大事：
businesses that were number one in their markets.
在他们市场上居于头等地位的工商企业。
2.1
- a best-selling record or book最热销的唱片; 最热销的书：
an album featuring seventeen top movie themes and six number ones.
一本汇集了17首最佳电影主题曲和6张最热销唱片的专辑。
3
- used euphemistically to refer to urine〈婉〉小便, 尿。
4
- a first lieutenant in the navy（海军）中尉; 舰务官。
1
- most important or prevalent最重要的, 首要的：
a number-one priority.
需优先考虑的头等大事。
1.1
- best-selling畅销的, 热销的：
a number-one album.
一张热销的专辑。