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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Abroad, it has been distracted from the historic challenge that American power faces in Asia.

在国外，分散了美国挑战亚洲地区的力量。

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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

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.

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He is a co-author of three books on teams, including the best-selling, Self-Directed Work Teams: The New American Challenge In 2011 he was given the Lifetime Achievement Award from the American Society of Training and Development, their highest recognition for contributions to the workforce learning and development profession.

FORBES: Strengths-based Leadership Development Expert

That left Brazil, led by Romario, carrying the South American challenge, while Italian Roberto Baggio hauled his team through the knockout stages in a trio of match-winning performances against Nigeria, Spain and Bulgaria.

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