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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Nina Hachigian is a senior fellow at the Center for American Progress and co-author of The Next American Century: How the U.S. Can Thrive as Other Powers Rise.

Nina Hachigian是美国进步中心的资深会员，同时也是《下一个美国世纪：美国如何和其他崛起国家共同繁荣》一书的合著者。

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The yang of America’s labor force is this: over a 40-year career, a man earns $431, 000 more than a woman on average, according to the Center for American Progress.

其阳面是：美国进步中心的数据显示，四十年以上工龄的男性平均比女性每年多挣431000美元。 其阴面是：这十年内，美国历史上男性首次失去了劳动力市场上的支配地位。

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And Gayle Smith - she's a senior fellow at the Center of American Progress, a long time watcher of affairs in Africa.

NPR: Words Matter: Terms of Global Conflict Debated

Brian Katulis, of the Center for American Progress and author of the book "The Prosperity Agenda, " has long called for a change in the U.S. approach to Pakistan.

NPR: Bush Meets With Pakistan's Leader

"The sanctions will force a choice between buying Iranian oil or engaging in the US financial system, the largest in the world, " said Brian Katulis of the Center for American Progress.

BBC: Iran's rial slides against US dollar on fresh sanctions