宾夕法尼亚州(Pennsylvania)：其别称为“拱心石之州”(Keystone State)。正如拱心石契合石拱门两边的石头，宾夕法尼亚州被看作是连接年青的美利坚合众国(American republic)的纽带。
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拱心石之州在化石燃料燃烧产生CO2上排名48，可吸入颗粒排名49，毒素暴露位居49。
The "Keystone State" ranks 48th in CO2 emissions from fossil fuel combustion, 49th for particulates in the air, and 49th for toxic exposure.
宾夕法尼亚州的别名是“拱心石之州”。就如拱心石支撑起石拱一样，人们认为宾夕法尼亚支撑起了年轻的美利坚共和国。
Pennsylvania's nickname is the keystone State. Just as a keystone holds together a stone arch, Pennsylvania was seen as holding together the young American republic.
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