It is the twenty-first Football World Cup.

这是第二十一届足球世界杯。

youdao

Russia is holding the twenty-first FIFA WORLD CUP now.

俄罗斯正在举办第21届世界杯。

youdao

Many doctors feel that this is a problem in the twenty-first century.

许多医生认为这是21世纪的一个问题。

youdao

Professor Burgess says the first ten years of the twenty-first century are expected to register the most attacks of any ten-year period.

VOA: special.2009.06.16

All of this is Darwinian thinking and, I think, increasingly will be central in importance in the twenty-first century.

这就是达尔文所思考的，我认为，这在二十一世纪会越来越重要。

耶鲁公开课 - 文学理论导论课程节选

What is it about the Greeks between the years that I mentioned to you that deserves the attention of people in the twenty-first century?

是什么使得久远的古希腊,会值得21世纪的人们,去关注和研究呢

耶鲁公开课 - 古希腊历史简介课程节选

By the first decade of the twenty-first century, I could no longer swing a golf club.

NPR: Excerpt: 'The Healing Of America'

The second decade of the twenty-first century will be the decade of the brain.

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He was Laurence Olivier reincarnated for a new the twenty-first century, a deconstructed style of performance.

NEWYORKER: A Beneficiary