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未经查明的空中飞行物，俗称飞碟，因为其与地外生命有关而备受关注。外星人是否真实存在？他们对于地球人又是怎样的态度？这些都是吸引着人们对于飞碟进行探究的问题。历史上多次出现飞碟的记载并流传着多例飞碟的事迹，是真是假？外星人真的来过么？
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