中科新闻网中华文明赞演讲稿:求救一篇文章！
来源：百度文库 编辑：中科新闻网 时间：2024/05/11 15:29:06
谁能找一篇关于UFO的英语文章，从起源说起的科普文章，谢谢谢！！！！！
我来写一篇：
the origin of UFO
when a bird flying in the sky,we know that it is a kind of animal with flying ability,it has wings with feather and powerful muscle. when a plane flying in the sky, we know that it is a kind of manmade machine,oil is its power source.when some unidentified flying objects appearing in the sky,we know nothing about it,so we call them UFO.