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中国的科学技术论文在2000年的时候在世界上的占比很小，到2018年的时候已经超过了美国，仅次于欧盟占世界第2位了。0 b7 M T3 ~7 E) k. G
日本科技论文发表的数量在过去20年中绝对数字没有什么增长，已经开始停滞不前了。中国有2000年的5%增长到2018年的21%，仅次于欧盟，成为世界第二。印度也很努力，在2018年达到中国2000年的比例水平5%。/ B) s: r/ f; i; m* n- f5 m, H
Although this report does not forecast future outcomes, the data show the evolution of the United States in the global S&E enterprise. The United States continues to lead globally in R&D expenditures, S&E doctoral-level degree awards, and production of highly cited research publications. At the same time, other nations, particularly China, are rapidly developing their S&E capacity. As a result, the United States has seen its relative share of global S&T activity flatten or shrink, even as its absolute activity levels kept rising. As more countries around the world develop R&D and human capital infrastructure to sustain and compete in a knowledge-oriented economy, the United States is playing a less dominant role in many areas of S&E activity.
