Hi, everybody. 大家好。 This week, I've been speaking about America's national security—our past, our present, and our future. 本周我想谈谈美国国家安全的过去，现在以及未来。 On Thursday, I outlined the future of our fig

Dear sisters and brothers, we realize the importance of light when we see darkness. 亲爱的姐妹兄弟们，看到黑暗我们认识到光明的重要。 We realize the importance of our voice when we are silenced. 在沉默中我们认识到声音的重要。 In the same wa

September 12, 2007 I send greetings to Muslims observing Ramadan in America and around the world. Ramadan, the holiest days of the Islamic faith, begins with the first light of dawn and commemorates t

Hi, everybody. This is commencement（开始，毕业典礼） season, a time for graduates and their families to celebrate one of the greatest achievements of a young person's life. But for many graduates, it also mea

Okay. 好了 So what is the daf-2 gene? 那么daf-2基因到底是什么？ Well as you know, genes, which are part of the DNA, 正如大家所知，基因是DNA的一部分 they're instructions to make a protein that does something. 它们是经编码的指令，用于制造