Bacteria are the oldest living organisms on the earth. 细菌是地球上最古老的生物。 They've been here for billions of years, and what they are are single-celled microscopic organisms. 它们已经存在数十亿年了，它们是单细胞微生物。 So they

For Immediate ReleaseApril 20, 2009 REMARKS BY THE PRESIDENT TO CIA EMPLOYEES CIA HeadquartersLangley, Virginia 3:41 P.M. EDT THE PRESIDENT: Thank you, everybody. (Applause.) Thank you. Thank you. (Ap

Maya Rudolph at Tulane We’re hard-pressed to imagine a more jubilant sendoff into the adult world than Maya Rudolph doing her Beyoncé impression while singing the National Anthem. Tulane

September 12, 2007 Section 202(d) of the National Emergencies Act, 50 U.S.C. 1622(d), provides for the automatic termination of a national emergency unless, prior to the anniversary date of its declar

比尔·盖茨和夫人梅琳达·盖茨在斯坦福大学2014年毕业典礼上的演讲。整个演讲以“乐观”为主线，强调了他们对科技的乐观态度，以及对世界美好未来的乐观态度。盖茨夫妇轮流讲述了自己的亲身经历和故事，告诉学生应该站在他人的立场上，感同身受那些处境不及自己的人，尽自己所能去帮助那些需要帮助的人，让全世界所有人类同胞都有一样的美好未来。 Stanford U