美国正在发生第四次工业革命吗？

Group 1 - Nvidia's market capitalization first surpassed $5 trillion on October 29, 2025, making it the first publicly traded company to reach this milestone [1] - This achievement signifies a quiet yet significant shift occurring in Silicon Valley [1] Group 2 - Nvidia's market capitalization first exceeded $4 trillion on July 9, 2025, surpassing Microsoft ($3.7 trillion) and Apple ($3.14 trillion) [3] - In 2025, Germany and Russia's nominal GDPs are approximately $5 trillion (third in the world) and $2.54 trillion (ninth), respectively [3]