《外星人类》是一本专门为青少年读者们准备的全面了解外星人的百科全书。全书内容丰富生动又奇妙，既描写了世界各地曾出现过的各种外星人事件，又涉及了人类一直无法真正得到解答的有关于外星人的问题。这些奇特的事件的解答，恐怕要青少年们自己去细致研究了！(Aliens is an encyclopaedia specially prepared for adolescent readers to comprehensively understand aliens. The book is rich in content and wonderful, not only describing a variety of alien events happened in various places of the world, but also involved in problems on aliens that cannot be solved by humans until now. The answers to these strange events may need to be studied carefully by adolescents!)