1952年，美国空军开始着手实施“蓝皮书计划”，这是一项针对不明飞行物的研究项目。
In 1952, the US Air Force began Project Blue Book, a study program on UFOs.
但美国空军方面却坚持认为：“自“蓝皮书计划”终止后，没有任何事件可以支持重启UFO调查行动。
The US Air Force, however, insisted: "Since the termination of Project Blue Book, nothing has occurred that would support a *resumption of UFO investigations".
但美国空军方面却坚持认为：“自“蓝皮书计划”终止后，没有任何事件可以支持重启ufo调查行动。”
Thee US Air Force, however, insisted: "Since the termination of Project Blue Book, nothing has occurred that would support a resumption of UFO investigations".
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