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从20世纪40年代起,据称在美国曾发生3起重大的飞碟空难事件。近半个世纪以来,由于美国政府出于种种目的,这3起飞碟坠毁案一直未为世人所知。
Since the 1940s, it has been reported that three major UFO incidents occurred in the United States. For nearly half a century, these three flying saucer crashes have not been known by the U.S. government for various purposes.