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关键词：美丽美利坚 我们 美利坚 叹为观止 重塑 极致 推向
It's the land we love and the land we think we know. We see America's breathtaking landscapes and wildlife as timeless, but the truth is very different. Its unique geography drives the forces of nature to extremes, shaping and reshaping the land and throwing down new challenges for life.