twenty-one
01
二十一
the number 21; the number of days in three weeks
例子
She will turn twenty-one next month and is excited to celebrate her birthday with friends.
她下个月就二十一岁了，很兴奋能和朋友们一起庆祝她的生日。
The legal drinking age in the United States is twenty-one, allowing young adults to enjoy alcoholic beverages.
美国的法定饮酒年龄是二十一岁，允许年轻人享用酒精饮料。
Twenty-one
01
二十一点, 黑杰克
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
