| 词汇 | twenty-first |
| 释义 | twenty-firstBrE /ˌtwenti ˈfɜːst/ NAmE /ˌtwenti ˈfɜːrst/ noun [sing. ] (informal , especiallyBrE ) a person's 21st birthday and the celebrations for this occasion * 21 岁生日；21 岁生日庆典 |
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