The other great principle of evolution is sexual selection, and it operates very differently. 进化的另一大原则是性选择，它运作的方式则大相径庭。 The peacock's magnificent tail is the most famous example of this. 孔雀那华丽的尾巴就是最著名
WEEKLY ADDRESS OF THE PRESIDENT TO THE NATION February 14, 2009 This week, I spent some time with Americans across the country who are hurting because of our economic crisis. People closing the busine
英语演讲比赛演讲稿：My Hometown 杨志腾 My Hometown Ladies and Gentlemen, Thanks for your coming, I fell so happy , I have this chance to stand there to share my ideas about my hometown with you all. A
Hi, and Merry Christmas. I’m honored to have the chance to speak with you and your family this year. Recently, we learned that our governments, working in concert, have created a system of worldwide m
