Hi everybody. This weekend, we'll dedicate the newest American icon on our National Mall - the National Museum of African American History and Culture. 嗨，大家好。本周末，我们将在国家广场把时间留给美国标杆建筑--非洲裔美国人历史和文化国家
Hi everybody. 嗨，大家好。 A few days ago, I unveiled a new national plan to confront the growing threat of a changing climate. 就在前几天，我推出了一项新的国家计划以应对日益增长的气候变化威胁。 Decades of carefully reviewed science tells
The President welcomes dozens of doctors from all over the country to the White House, and commends doctors in general as those “who know the health care system” and for being “some of the people who
Charles C. Mann在Ted的演讲，当地球人口超100亿，我们又将如何生存？ Charles C. Mann: How will we survive when the population hits 10 billion? 当地球人口达到100亿时，我们将如何生存 How are we doing? No, no, no, by that, I meant, how are we, h
