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你知道地球是怎么诞生的吗？
你是否有过这样的疑问，我们的地球是从哪里来的？它是怎么形成的？它又是怎么变成现在这个样子的？今天，我就来给你揭开这个谜底，让你看到地球的前世今生，你一定会大吃一惊！
宇宙知识探秘197/345
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