nationalgeographic2011.1.24---黄石国家公园

nationalgeographic2011.1.24---黄石国家公园
Yellowstone: World's First National Park
Yellowstone National Park was the first national park in the world, and larger than some U.S. states. And 90 percent of the park has barely been touched
黄石：世界第一座国家公园
黄石国家公园是第一个国家公园在世界上，比美国的一些州大。而百分之九十的公园几乎没有被触及