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来源:雅诚德英语网
By the end of the 19th century, as the frontier vanished, the US had a mild panic attack.
到19世纪末,随着边疆的消失,美国人开始感到些许的恐慌。
By the end of the 19th century, as the frontier vanished, the US had a mild panic attack.
到19世纪末,随着边疆的消失,美国人开始感到些许的恐慌。