One of the fundamental challenges of our time is building an economy where everyone gets a fair shot, everyone does their fair share, and everyone plays by the same rules. And as many Americans rush t

You'll see here that some light from behind it gets lensed, and some light does a loop-the-loop around the entire orbit of the black hole. 你现在看到的是在黑洞后面的一些光透过它，有些光的确会一直绕着黑洞转。 But when you get enoug

We have a chance this year, to reclaim our heritage as a country that dreams big and makes the impossible happen. 我们今年有一个机会，重现我们作为一个国家敢于梦想、敢于冒险的遗产。 Fortunately, Donald Trump is incapable of thinking s

February 16, 2008 PRESIDENT BUSH: Mr. President, thank you. Laura and I are honored to be with you -- and the First Lady. I gratefully accept this on behalf of the American people. I stand here by you

President Bush Visits Fort Campbell THE PRESIDENT: Thank you. Please be seated -- unless, of course, you don't have a seat. (Laughter.) I am honored to be here at Fort Campbell. (Applause.) I'm honore