The last decade of the twentieth century and the first decade of the twenty-first century were full of challenges and surprises, including several long and debilitating wars that are not yet over.

从二十世纪九十年代到二十一世纪的这数十年充满了挑战与意外，包括几场仍在持续的漫长又让人精疲力竭的战争。

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In a famous essay right after the Second World War, Time magazine founder Henry Luce referred to the twentieth century as the American century. To whom does the twenty-first century belong?

就在第二次世界大战后的一篇著名文章中，“时代”杂志创始人Henry Luce称二十世纪为美国世纪，二十一世纪属于谁？

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My wife had her sixtieth birthday in June and our twenty-fifth wedding anniversary was the twentieth of August.

我的妻子有了她的第六十个生日在六月，我们的五分之二十个结婚纪念日是八月二十日。

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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

In the second half of the twentieth century and up now into the twenty-first century, writers were thinking very hard about what to do stylistically with all the innovations that come in that powerful period known as modernism.

自二十世纪下半叶,直至现今二十一世纪,作家都在努力思考在现代主义影响,深远的这个时期里该怎样进行文体上的创新。

耶鲁公开课 - 1945年后的美国小说课程节选

She has written about British book publishing in the nineteenth, twentieth and twenty-first centuries, and is a specialist in the use of quantitative methods in the study of the industry.

UNESCO: Purpose/Objectives of the Chair/UNITWIN Network

Indeed, the America of the late twentieth and early twenty-first centuries has witnessed an explosion of government regulations that have jeopardized private ownership of property, often for questionable purposes that have little to do with the limited types of public use envisioned by the framers of our Constitution.

CNN: McCain's August 6, 2007, speech addressing private property rights

As is true for most of us who grew up in the latter half of the twentieth century, the first twenty-two years of my life seemed to revolve around an unending series of tests designed to rank me versus my peer group.

FORBES: Who Sets Your Benchmarks?