UFO，始终是一个充满诱惑的名词。二三十年前，报刊上的UFO奇闻不是出现在南美洲的偏僻山林，就是大洋深海中的荒岛———总之是你到不了、也查不清的地方。然而，自２０世纪８０年代以来，神秘的UFO离我们越来越近，甚至敢于在上海、北京等大城市的上空不分白天黑夜，无论风霜 UFO, is always a tempting term. Twenty or thirty years ago, the UFO anecdotes in the press did not appear in the remote forests of South America, or the deserted islands in the depths of the oceans - in short, where you can not reach or find out. However, since the 1980s, the mysterious UFO has been getting closer and closer to us, even daring to stay in Shanghai, Beijing and other big cities over the whole day and night, regardless of wind and frost