Hi, everybody. 大家好! At a moment when our economy is growing, our businesses are creating jobs at the fastest pace since the 1990s, and wages are starting to rise again, we have to make some choices ab

And lastly, here's Destin, from "Smarter Every Day," 最后是《每天聪明一点点》的德斯丁， talking about the conservation of angular momentum, and, since it's YouTube, cats: 为我们讲述动量守恒，由于是在YouTube上，所以他用猫来举例： Hey, it's me,

Now, here you see-of course, as you go further on, 如图所示－当然，当你将视线拉远， these trucks become like a pixel. 这些卡车彷佛图中的小点。 Again, imagine those all back and forth there. 同样地，想象一下这片区域。 How large is that one po

Responsibility is a Badge of Honour for Youth责任感——青年人荣誉的标志 　(96年“21世纪杯全国大学生英语演讲比赛”二等奖获得者，北京外国语大学 徐义成) 　Facing this audience on the stage, I have the exciting feeling of partici

March 24, 2007 THE PRESIDENT: Good morning. The position of U.S. Attorney is one of the most important jobs in the Justice Department. U.S. Attorneys are appointed by the President, and they play a le