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悄悄告诉你，我们的地球有一本日记，里面藏着地球的许多秘密：有地球的诞生、年龄，地球的身高、体重，还有地球的作息时间、独特构造......不看不知道，这本日记里记的事情竟然如此奇妙而有趣。要是你也想知道地球的这些秘密，那就让我们一起翻开这本日记认真研究研究。嘘！可别让地球知道了！
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