xxi
参考词典中xxi的常规释义：
基本释义
- num.罗马数字 21
英英解释
1个名词解释
- the cardinal number that is the sum of twenty and one
[同] 21, twenty-one, xxi
点击查看……1个形容词解释
- being one more than twenty
[同] 21, twenty-one, xxi
点击查看……- the cardinal number that is the sum of twenty and one
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