Mrs. Obama this afternoon visited the Department of the Interior, where she spoke about how important it is to protect our natural resources and move towards a clean, sustainable energy future. "

So, these are the words I am waiting to hear, but from my son, not my daughter. 这些话是我想听到的，但应该是从我儿子嘴里说出来，而不是我女儿 But at first I did not know what to do. 刚开始的时候，我真的不知道该怎么办 But then, over time, I have com

Four hundred parts per million: that's the approximate concentration of CO2 in the air today. What does this even mean? 百万分之四百：这就是现在空气里二氧化碳大概的浓度。这意味着什么呢？ For every 400 molecules of carbon dioxide, we

So I'd like take this opportunity to thank our parents and those who have supported us to get to this point so far 我希望借此机会感谢我们的父母 还有那些在我们前进道路上给予支持的人们 and thank them in advance for their support as

THE PRESIDENT: Hello, hello! How are you? Thank you, everybody. Thank you very much. (Applause.) Thank you so much, everybody. Please have a seat. Welcome to the White House. And congratulations, a li