It rotated to north polar region, zoomed into ice fields , and then down a volcanic caldera.
它转向北极地区, 放大冰原,深入一个火山口.
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Much of Yellowstone National Park is a giant collapsed volcano, or a caldera.
黄石国家公园的大部分地方是一座坍塌的大火山, 或是一个喷火山口.
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Leaving the visitor center, follow Crater Rim Drive for 11 miles encircles Kilauea Caldera.
离开游客游览中心, 随后驾车来到距离11英里环绕基拉韦厄火山口陨石坑周边.
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He pointed out that Yellowstone is caldera of a volcano that last erupted 70,000 years ago.
他指出黄石是一个70,000年前喷发过火山的巨火山口.
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