That American challenge is taken seriously by a man who prefers to be called Michael outside China and has maintained his admiration for the US in spite of his scholarship failures.

俞敏洪非常认真地看待美国人带来的挑战。 尽管当初申请奖学金失败，但这个更愿意自己在国外被称作麦克尔的男人仍然对美国充满赞叹。

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Economic inequality is the "defining challenge of our time", President Barack Obama declared in a speech last month to the Center for American Progress.

美国总统巴拉克·奥巴马上月在美国发展中心的一次演讲中宣称，经济不平等是“我们这个时代的决定性挑战”。

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But he says the American people are up to the challenge of a rapidly deteriorating economy.

但是他表示，美国人民能够迎接经济急剧恶化所带来的挑战。

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The American Le Mans Series became the first racing event to use the protocols in its Green Challenge competition.

VOA: special.2009.11.03

I am not going to walk away from the American people. I am not going to walk away on this challenge.

VOA: standard.2010.02.06

Writer-director Richard Linklater believes any moviemaker would be daunted by the challenge of telling the story of the man behind the great American film Citizen Kane;

VOA: standard.2009.12.17

We are proud to lead by example, but the quest for human equality and dignity is not simply an American challenge.

WHITEHOUSE: Ambassador Susan Rice on International Day against Homophobia and Transphobia | The White House

Meanwhile, Maris Strombergs of Latvia kept his nerve in the face of a two-pronged American challenge to win gold in the men's BMX final.

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Hanson, who was tied for 52nd at Oakland Hills last week, agreed that the Arlandastad course north of Stockholm was very different from the American challenge.

BBC: Dougherty shares lead in Sweden