In the first century A.D., Pliny the Elder wrote of using sea urchin ashes to treat baldness.

公元一世纪，老普林尼曾写过用海胆的灰烬治疗来秃头。

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He says a new system is needed to meet the speed and complexity of a twenty-first century global economy.

VOA: special.2009.06.19

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

He's the most famous psychologist ever and he's had a profound influence on the twentieth and twenty-first century.

他是史上最著名的心理学家,对20世纪与21世纪,的心理学界都有着深远的影响。

耶鲁公开课 - 心理学导论课程节选

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

NPR: Excerpt: 'The Healing Of America'

She accepts that Revelation was probably written, toward the end of the first century C.

NEWYORKER: The Big Reveal

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

FORBES: Can Science Eliminate Disease?