求翻译：外星人是人类对地球以外智慧生物的统称。古今中外一直有关于“外星人”的假想，在各国史书中也有不少疑似“外星人”的奇异记载，但现今人类还无法确定是否有外星生命，甚至是“外星人”的存在。2011年4月初，美国联邦调查局最新披露的一段奇特备忘录证实，在1950年之前曾有外星人着陆美国新墨西哥州。是什么意思？

Alien is intelligent life outside of Earth's collectively. All times and has been on the "alien" scenarios in history books, there are many countries suspected "alien," the strange records, but now can not determine whether the human extraterrestrial life, or even "alien" presence. Early April 2011,

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The alien is the humanity to the Earth outside the wisdom biology general designation.The ancient and modern in China and abroad always has about “the alien” the imagination, also has many doubtful “the alien” in the various countries' history book the strange record, but the nowadays humanity is al

Collectively of extraterrestrial intelligent beings other than humans on Earth. At all times and has been on the "alien" scenario, in the countries history books quite a number of suspected "alien" singular records, but humans could not be determined whether there is life on other planets, and even