也许你以前曾经买过那些那些摺纸玩具，他们能够做出洋娃娃或天鹅？TED 的研究会员 Manu Prakash 和他的团队成功做出像折纸一样简单的显微镜。讲者在这段影片中提供了让人惊奇的示范，并告诉我们这个装置将如何对开发中国家的健康问题造成影响。另外，这项技术也能够让所有事情都变成有趣的手作科学实验。 Manu Prakash在Ted英语演讲：只要50美分,就能拥有如折纸般的显微镜也许你以前曾经买过
My fellow citizens: the four years which have elapsed since last I stood in this place have been crowded with counsel and action of the most vital interest and consequence. 同胞们：自从上次我站在这里发表演说到今天，已有四年时光
Across the generations we have proclaimed the imperative of self-government, because no one is fit to be a master, and no one deserves to be a slave. 每一世代,我们重申着民有政权的重要性,没有什么人应该是主人而另一些人应该做奴隶. Advancing
THE PRESIDENT: Good morning. This week was filled with more good news about America's economy. We learned that our economy grew at an annual rate of 3.5 percent in the fourth quarter of last year. Ove
