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发布时间：2026-03-19 02:20:31 作者：代彬婷,文章来源：
Weather balloons. Atmospheric phenomena. Experimental military aircraft. There are explanations for most unknown flying objects, but not all of them. So, are flying saucers real? Many Americans believe extraterrestrial visits are possible, and in 1952, the U.S. Air Force even launched Project Blue Book, history's most extensive government investigation into UFOs. Join us as we ...
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