求翻译：UFO全称为不明飞行物，也称飞碟（unidentified flying object，简称UFO）是指不明来历、不明空间、不明结构、不明性质，但又漂浮、飞行在空中的物体。一些人相信它是来自其他行星的太空船，有些人则认为UFO属于自然现象。20世纪40年代开始，美国上空发现碟状飞行物，当时称为“飞碟，这是当代对不明飞行物的兴趣的开端，后来人们着眼于世界各地的不明飞行物报告，但至今尚未发现确实可信的证据。许多不明飞行物照片经专家鉴定为骗局，有的则被认为是球状闪电，但始终有部分发现根据现存科学知识无法解释。是什么意思？

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The UFO was called UFO, also known as UFO (unidentified flying object, known as UFO) is unknown, unknown space, an unknown structure, an unknown character, but also floating in the air, and flying objects. Some people believe that it is from the other planets of the space ship, and some were of the

UFO called UFO, also known as UFO (unidentified flying object, referred to as UFO) refers to the unknown unknown unknown, unknown space, structure, properties, and floating objects, flying in the air. Some people believe that it is a spaceship from other planets, some people think that UFO is a natu