1 ADJ [ADJ n] 头号的;头等的;最重要的 Number one means better, more important, or more popular than anything else of its kind. 头号的;头等的;最重要的 [informal]
2 N-COUNT 排行榜冠军(指周销售量最高的流行歌曲CD、歌手或乐队组合) In popular music, the number one is the best selling CD in any one week, or the group or person who has made that CD. 排行榜冠军(指周销售量最高的流行歌曲CD、歌手或乐队组合) [informal]
3 PHRASE [VERB inflects] 只想到自己的利益;只顾自己 If you are looking out for number one, you are thinking of yourself rather than considering other people. 只想到自己的利益;只顾自己 [informal]
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