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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Its control center is based in the forebrain, and it regulates breathing for use in speech, singing, sighing, and so on.

它的控制中心在前脑，而且它管理说话、唱歌、叹气等行为下的呼吸活动。

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But the start of the rainy season has moved that speech indoors to a conference center.

但是由于雨季开始，这次演讲已经改在室内的一处会议中心。

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"I know we've made tactical errors, thousands of them, I'm sure, " she said in a speech at Blackburn's Chatham House -- a center for independent research on global issues.

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The right-of-center government of Prime Minister Benjamin Netanyahu issued a short and restrained statement of support after the speech.

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