名词 twenty-one:

1. the cardinal number that is the sum of twenty and one

2. a gambling game using cards; the object is to hold cards having a higher count than those dealt to the banker up to but not exceeding 21

形容词 twenty-one:

1. being one more than twenty

twentynum.二十twenty-sevennum.二十七twenty-threenum.二十三twenty-eightnum.二十八twenty-ninthnum.第二十九twenty-firstnum.第二十一n.<英>二十一岁生日twenty century20世纪twenty-secondnum.第二十二twentysomethingn.二十多个; 二十多岁twenty-twentyadj.[医]视力正常的twenty to seven七点差二十分, 六点四十分