August 29, 2008 PRESIDENT BUSH: It is such an honor to welcome a man I've come to admire a lot to the Oval Office, President Kikwete of Tanzania. He comes representing a great country. He also comes r

THE PRESIDENT: Thank you. Thank you. (Applause.) Thank you, everybody, please have a seat. Have a seat. Well, good afternoon, everybody. AUDIENCE: Good afternoon. THE PRESIDENT: Welcome to the White H

The reason that Vibrio fischeri is doing that comes from the biology. 费氏弧菌的发光现象来自生物学上的原因。 Again, another plug for the animals in the ocean, Vibrio fischeri lives in this squid. 接下来，我们再来看一个海洋生物：费式弧菌寄生在

The tide of war is receding. When I took office, roughly 180,000 Americans were serving in Iraq and Afghanistan. By the end of this year, that number will be cut in half, and it will continue to decli

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