We earn our livelihood in peaceful competition with people all across the earth. 今天，我们美国人通过同世界各地人民进行和平竞争来谋求生存。 Profound and powerful forces are shaking and remaking our world, and the urgent question
I'd like you to come back with me for a moment to the 19th century, specifically to June 24, 1833. 我希望先带你们回到19世纪，确切地说回到1833年6月24日。 The British Association for the Advancement of Science 英国科学促进协会正在
