stony heart
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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