从黄石公园的间歇泉到奥林匹克半岛崎岖的太平洋海岸,从萨瓜罗的炎热沙漠到北极冰冷的大门,从大沼泽地的亚热带草海到世界着名的优胜美地山峰,从神秘的大烟山到地球上最大的峡谷,这是一次史诗般的旅程: 大峡谷。
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