如果你乘坐的汽车，跟在一串悠哉游哉的马车后面慢慢爬行，举目四望，周围尽是使用畜力和手工工具耕作的农庄，你会相信这是在科技高度发达的美国吗？世界之大，无奇不有。美国社会更是五花八门。在美旅游，满眼看的是现代科技给人们带来的极大便利。然而来到宾夕法尼亚州的“ Could you believe this is a science-advanced U.S. if you ride in a car, crawling slowly behind a series of carefree carriage and looking around and surrounded by farmsteads that use animal power and hand tools to cultivate? The world’s great wonders. American society is more varied. In the United States to travel, eye-catching is the great convenience brought by modern technology to people. However came to Pennsylvania’s "