... 理想空气循环 ideal air cycle 理想空气标准 ideal air standard 理想燃烧 ideal combustion ...
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The average concentration of particulates in city air during 2008, for example, was six times the ideal standard recommended by the World Health Organization.
以2008年全年的数据为例，北京市市区空气单位体积微小聚合颗粒数是世界卫生组织标准的6倍。
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