在2010世界经济论坛联盟国家排名中，美国整体基础设施的质量排名23位，介于西班牙和智利之间。
In the WEF 2010 league table America now ranks 23rd for overall infrastructure quality, between Spain and Chile.
把这个国家所有的基础设施加起来，再想想两千七百万多大专生和大学生，就算所有这些脑子的质量成正态分布，也将是一股巨大的能量。
Now take all this infrastructure and mix it together with 27 million students in technical colleges and universities — the most in the world.
空气质量数据是利用国家或特定城市公开可用的资料来源汇编而成的，这些资料以各城市开展的空气质量监测结果为基础。
Air quality data have been compiled from publicly available national or city-specific sources, which are based on results of air quality monitoring conducted by individual cities.
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