UFO即“不明飞行物”的简称,如今已成为全世界通行的一个热门词。从远古的模糊记录到现代的目击报告,各种UFO层出不穷,是自然现象还是外星人出没一直众说纷纭。其实,地球人自己搞出来的一些怪异飞行器也很容易被误认为是UFO,只不过离来去无踪的境界还差得很远。“双环机”变形记以莱特兄弟为代表的早期航空先驱大都从观察飞鸟获得灵感,研制出简陋的飞行器,在外形上自然就有着相似 UFO or “UFO” for short, has now become a popular word around the world. From ancient vague records to modern eyewitness reports, various types of UFOs emerge in abundance, whether they are natural phenomena or alien haunted opinions. In fact, some of the weird aircraft made by the Earth’s own people can easily be mistaken for UFO, but they are still far from being gone. Most of the early aviation pioneers represented by the Wright brothers were inspired by the observation of birds and developed primitive aircraft that naturally had similar appearance