twenty-first
US
UK twenty-first, 21st adj: (21st in a series or list)
SC 21的
SC 第21的
This is the company's twenty-first year in business.
twenty-first, 21st adj: (century: 2000s)
SC 21世纪的
What did you and your family do to usher in the twenty-first century?
你和你的家人做了什么来迎接21世纪的到来？
twenty-first, 21st, the twenty-first, the 21st n: (in a series, list: 21st item, person)
SC 第21
Jack was the twenty-first out of twenty-two people to win an award that night.
twenty-first, 21st n: informal (21st birthday)
SC 21岁生日
Have any big plans for your twenty-first this weekend?
你对这周末的21岁生日有什么重大计划吗？
the twenty-first, the 21st n: (twenty-first day of the month)
SC 21号
Is today the twenty-first?
今天是21号吗？
the twenty-first of, 21st, 21st of, the 21st, the 21st of n: UK (twenty-first day of specified month)
SC …月的21号
I'm afraid Mr. Cooper is away, and won't be back until the 21st of April.