美國歷史上最大規模的不明飛行物調查藍皮書計劃是誰推動產生的？他們在項目進行的17年期間都調查了什麼？為什麼公眾對不明飛行物的調查結果一直都不滿意？華盛頓不明飛行物目擊事件是怎麼回事？
美國歷史上最大規模的不明飛行物調查藍皮書計劃是誰推動產生的？他們在項目進行的17年期間都調查了什麼？為什麼公眾對不明飛行物的調查結果一直都不滿意？華盛頓不明飛行物目擊事件是怎麼回事？
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