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  1. united state. · proceedings of the national academy of sciences of the united states of america,简称pnas,是美国科学院院报。该 … 用法:united state较为口语化,使用频率较高,美国说常说the states。 2. america. United states是美国。 us和usa都是美国的英文缩写,us是united states的缩写,直接翻译为“合众国”,usa是美利坚合众国(united states of … 美国的全称是美利坚合众国(united states of america),简称“美国”(united states)。 美国是由华盛顿哥伦比亚特区、50个州和关岛等众多 …