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。

youdao

The archaeological evidence clearly indicates, though, that Teotihuacán was the center that did arise as the predominant force in the area by the first century A.D.

然而，考古证据清楚地表明，特奥蒂瓦坎是一个中心，在公元一世纪崛起成为该地区主导力量。

youdao

It has now reached a point where a growing number of people believe that it is far too high, and that bringing it down will be one of the great challenges of the twenty first century.

现在，到了越来越多人认为它太高了的程度，而且使它降低将是21世纪最大的挑战之一。

youdao

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?