And the computer models, no matter how many that you have and how many people that you use, 那些计算机虚拟建模，不管你做了多少，用了多少人 are never going to be able to arrive at the same conclusions. 结论永远不同 Four years ago

Hi, everybody. This week, I visited a company in Raleigh, North Carolina that helps make electric motors that save businesses money on energy costs and cut harmful carbon pollution. And I stopped by N

THE PRESIDENT: It is my pleasure to be back in New Orleans. I want to thank the Lieutenant Governor, the Mayor, the head of the City Council, the parish presidents for joining me. I committed to stay

Hi, everybody, and Happy New Year. 大家好，新年快乐。 This is a time when we look ahead to all the possibilities and opportunities of the year to come-when we resolve to better ourselves, and to better our rel

And here's what it feels like to be a kid in this checklisted childhood. 那么在清单式童年中长大的孩子是怎样的呢。 First of all, there's no time for free play. 首先，他们没有自由玩耍的时间。 There's no room in the afternoons, because ev