Hi, everybody. I'm speaking to you today from Springfield, Illinois. 大家好！今天，我在伊利诺伊州斯普林费尔德市向大家演讲。 I spent eight years in the state senate here. It was a place where, for all our surface differences

President Obama at the Martin Luther King, Jr. Memorial Dedication： We Will Overcome THE PRESIDENT: Thank you very much. (Applause.) Thank you. (Applause.) Please be seated. An earthquake and a hurric

Protection of the Environment Once man did not have to think about the protection of his environment. There were few people on the earth, and natural resources seemed to be unlimited. Today things are

But there's not an amount of people that are scalable, but how many people do you currently have monitoring these accounts, and how do you figure out what's enough? 你说从事这项工作的人数永远不够，那么你现在到底雇佣了多

Hi, everybody. This week, we made it official—I'm going to Cuba. 大家好。这个星期，我们正式决定，我即将出访古巴。 When Michelle and I go to Havana next month, it will be the first visit of a U.S. president to Cuba in nea