40 years later, aero experts coined the term transonic.40年后空气动力学专家创造了跨音速这个术语。The ...

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So a little unknown secret is --那么, 一个不为人知秘密是 --did you see the one with the guy, he's go ...

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What I want to talk to you about today is我今天想要谈的是virtual worlds, digital globes, the 3-D Web ...

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However, to me, the 500 is但是对我来说这500个（遗产）really just the first 500.只是一个开始In order ...

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The results of our work in the field我们的成果are used to produce被用于媒体创作media and deliverable ...

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I'd like to start with a short story.我想先讲个故事。It's about a little boy有个小男孩whose father w ...

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My fellow Americans, it has been the honor of my life to serve you. I won't stop.我的同胞们，能够为 ...

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And I hope your faith has, too.我希望你的信念也能使你受益匪浅。Some of you here tonight or watching ...

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Sometimes you'll win. Sometimes you'll lose.有时你会成功，有时你将面临失败。Presuming a reservoir of ...

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And to all of you out there, every organizer who moved to an unfamiliar town,所有支持我的人：每一个 ...

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To Joe Biden,the scrappy kid from Scranton who became Delaware's favorite son,乔·拜登，从斯克兰顿的 ...

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And that's not easy to do.要做到这一点并非易事。For too many of us, it's become safer to retreat int ...

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Rivals like Russia or China cannot match our influence around the world,俄罗斯和中国这样的对手也不可 ...

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We weaken those ties when we define some of us as more American than others;如果我们认为一部分人比其 ...

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Our Constitution is a remarkable, beautiful gift.宪法是我们无可比拟的、天赋的优势。But it's really j ...

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For white Americans, it means acknowledging that the effects of slavery and Jim Crow didn't suddenly ...

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Because of the extraordinary courage of our men and women in uniform, because of our intelligence of ...

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And that's why, for the past eight years, I've worked to put the fight against terrorism on a firmer ...

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It is that spirit, born of the Enlightenment, that made us an economic powerhouse,这一精神起源于启蒙 ...

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And isn't that part of what so often makes politics dispiriting?不正是这些因素使人们对政治感到失望的 ...

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