I'm not even telling you the story because I think we should be running more carefully controlled randomized trials in all aspects of public policy, 我跟你说这个故事也不是因为我认为，我们在公共政策的各个方面，做随机抽样试验时，应该更小心， altho

Ladies and Gentlemen, this is Joe Biden and I'm here filling in for President Obama, who is traveling abroad. 女士们，先生们，我是乔·拜登，由于奥巴马总统在海外出访，今天由我来代替他发表演讲。 And I'm here with a simple message: midd

In the name of God, the most beneficent, the most merciful. 以最善良，最慈悲的真主名义。 Honorable UN Secretary General Mr Ban Ki-moon, respected president of the General Assembly Vuk Jeremic, honorable UN envoy fo

I must say that before I went to the U.S., I didn't consciously identify as African. 我不得不强调，在我前往美国之前，我从来没有有意识地把自己当作个非洲人。 But in the U.S., whenever Africa came up, people turned to me. 但在美国的时候，每当人们提到“非

Long Live the Understanding 　When we teenagers are rocking our bodies with the beat of rock music, when we are enjoying a glass of coke, when we are surfing on the Internet, our parents always show th