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在交通和通讯并不发达的时代,人们往往要花上好几个月才能收到亲朋好友的消息.1860年,一家叫做Pony Express的美国公司改变了这种状况.rnHave you ever gotten a letter?How long did it take to get to you?In the mid-1800s, a letter could take many months to get from east to west.All of that changed on April 3, 1860,with the birth of the Pony Express.