It has nearly 5 million tourists a year, but visitors see only a tiny fraction of the Grand Canyon's true beauty. Some of its backcountry has almost never felt the tread of a human foot. Even scientists know precious little about the canyon's 91 mammal species and more than 350 types of birds, its vegetation, and how and when it was formed. Now, National Geographic joins a rare...$不是纯风光展示，而是人与自然；应该普及。
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