President Obama’s Message to Team USA Today marks the beginning of the 2010 Winter Olympic Games. President Obama taped a special video message to welcome and encourage the U.S. Olympic and Paralympic
The new realities in our economic landscape are already upon us 经济领域中新的情况已经向我们提出了新的挑战 intense competition for capital, access to new technologies and new markets. 资本、新技术和新市场的激烈竞争。 External events can
人体通过晒太阳来合成维生素D，可是皮肤科医生理查德·威勒指出，阳光还可以带来另一个惊人的益处。他的团队通过新研究表明：一氧化氮这种大量储存在皮肤中的化学传递质，能通过紫外线照射而释放出来，对血压和心血管系统产生很大益处。这是什么意思呢？那好，就从解释为什么苏格兰人比澳大利亚人更容易生病开始吧……演讲视频（无字幕）：Richard W
Hi everybody. This weekend, we'll dedicate the newest American icon on our National Mall - the National Museum of African American History and Culture. It's a beautiful building, five stories
