找一篇关于UFO的英语演讲稿我是初三的学生,对于UFO也不是很了解,希望高手指教啊!星期一就要演讲了,篇幅小一些,顺便写

UFO Flying saucers), (from the Object is Unidentified, refers to find all the recognition or not without the UFO, The experts, scientific workers, not identify the flying object recognition. The words on the first appeared in the 1940s the survey report in the American air force.June 24, 1947, an American businessman, Kenneth - Arnold driving private aircraft over the mountains through Washington Rainier, see the glow of nine objects like saucers
As a fast moving formation. It is the modern research of ufos, but this is not the first time I saw a UFO, China ancient times the huawen version of the museum in existing - related historical records, later generations have this kind of UFO. The era of 19th century Russia has a detailed report. In addition, each country prehistoric sites, construction, paintings, 50's in about UFO's record. In 1942, a foreigner in tianjin street shooting a UFO photographs, it is the earliest human experts think is a UFO photographs.According to the report since hundreds of UFO phenomenon can be divided into five categories: one, the flying objects known or natural phenomena, known as the balloon, life, then, satellites, and insects rocket debris and birds, etc, Second, the particular circumstances of some social group or individual hallucinations, psychological phenomenon, Third, the unknown, biologists think natural life in nature but solid, liquid, gas shall have the fourth life, but that is unconfirmed, Four, the unknown phenomena of nature, such as DeGuang fireballs, lightning, plasma, Five, people can not completely understanding of manufacturing, intelligent vehicle or UFO, people often say "flying saucers" and "aliens".