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（无字幕）： Richard Weller: Could
It's change that can broaden opportunity, or widen inequality. 这场巨变能够带来机遇，也会扩大不公。 And whether we like it or not, the pace of this change will only accelerate. 无论我们喜欢与否，这场巨变的进度只会越来越快。 America has b
June 6, 2008 THE PRESIDENT: Thank you very much, Bonnie, for inviting me here. I'm proud to be here with Secretary of State Rice, Secretary of Treasury Paulson. Ambassador, thank you for being here. I
Hi, everybody. Last week, without much fanfare（吹牛，炫耀）, Members of the House of Representatives banged a gavel（小木槌）, turned out the lights, and rushed home, declaring their work finished for now. If th
