And we actually, in this case, I'm sorry to say, it happened -- it was serendipitous. 实际上在这件事情上，我很遗憾地说，我们找到了，是偶然间发现的。 Because I got a phone call from our chief chemist and he said, 我接到我们的一位首席化学家打来电话，他

The third way that I think we can help make our peace with regret is through the passage of time, which, as we know, heals all wounds-except for tattoos, which are permanent. 第三点我想就是通过时间的流逝来慢慢平和地面对遗憾，

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(中英双语) 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。 Th

Franklin Delano Roosevelt: Pearl Harbor Address to the Nation (December 8 ,1941) Mr. Vice President, Mr. Speaker, Members of the Senate, and of the House of Representatives: Yesterday, December 7th, 1

Remarks of President Barack ObamaWeekly AddressWashington, D.C. Good morning. I want to briefly share some news about our economy, and talk about the work that we’re doing both to protect Americ