求翻译：Sometimes people find really wonderful things when they are not looking for them. One example was John Colter. Colter was a mountain man who lived alone in the Rocky Mountains of the United States. He loved to walk in the mountains, but one day in 1803 he saw a strange sight. Water was shooting high into the air and falling into a green pool. It was a natural water fountain. Colter found other pools of blue water. Some of the pools were hot. The chemicals in the water made a beautiful color, but they also made it smell bad. Nearby there were large, clear lakes and spectacular waterfalls on cold, clear mountain rivers. Colter was excited, so he told others about the place. However , the other people did not believe him. They thought that he was a dreamer, a fool. Afterthey saw these wonders, they too were excited. Today the place Colter discovered is known as Yellowstone Park.是什么意思？

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