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本書收集了最新的有關外太空精靈（UFO）的資料，包括各國最近的目擊UFO的記錄以及重要的外星人綁架事件。隨著不明飛行物目擊事件的增多，科學界議論紛紛，人們對不明飛行物有著許多不同的解釋，比如，認為是自然現象或對已知現象的誤認、心理現象，等等，還有人變為是地外高度文明的產物等。
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