自然指数：十强科研城市中中国首次占据一半以上

Core Insights - The article discusses the 2025 Nature Index focusing on research output changes in major global cities for 2024, highlighting China's significant presence in the top research cities [2] Group 1: Research City Rankings - China occupies more than half of the top ten global research cities for the first time, increasing from five to six cities from 2023 to 2024 [2] - Beijing retains its position as the top research city globally since 2016, while Shanghai remains in second place [2] - Other cities in the top ten for 2024 include New York metropolitan area, Boston metropolitan area, Nanjing, Guangzhou, San Francisco Bay Area, Wuhan, Baltimore-Washington, and Hangzhou [2] Group 2: Performance of Chinese Cities - Guangzhou improved its ranking from eighth in 2023 to sixth in 2024, surpassing the San Francisco Bay Area [2] - Wuhan continues to rise in the rankings, moving up one position [2] - Hangzhou entered the top ten for the first time, moving up from thirteenth place in 2023 [2] Group 3: Research Output Growth - Beijing's research output increased by over 9% from 2023 to 2024, while Shanghai's output grew by nearly 20% [2] - All American cities in the top ten experienced a decline in their adjusted share of research output during the same period [2]