THE PRESIDENT: First of all, I want to thank leaders and small businesses and workers here in Grand Rapids for joining me. I explained to them why I felt the rescue plan was necessary. I explained to
THE PRESIDENT: Hey, guys. COMMANDER ZAMKA: Good morning from the International Space Station and from the Space Shuttle Endeavour, Mr. President. THE PRESIDENT: Well, it's great to talk to you guys. I
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
