21
近义词：xxi，twenty-one，
英英释义
Noun
- the cardinal number that is the sum of twenty and one
Adjective
- being one more than twenty
例句
- A person reaches his majority at the age of 21.一个人二十一岁达到法定成年。
- Tom said he would be 21 the following day.汤姆说他明天就满二十一岁了。