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这张图可以看出，计算机和数学专业外国人占50%以上，心理学是美国的传统强势学科啊，外国人的占的比例自然很小。- U& ?4 ~- H3 T2 ?8 i" J& K F
大约有30%的科技工作者来自外国。美国大约有700万个科学技术工作。可想而知，美国的科学和技术发展是非常需要国外的人才来补充的。但脱离了后援，后续动力就会打折扣了。% l0 I5 x& X( |" r# ~( Q p7 N; D ^
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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.
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文章的结论很清晰地指出随着世界各国对于研发和人才的投入，美国的重要性在许多领域开始下降了。$ G% W% R* {# B* C0 t! B: k
