1. Did Sir Arthur believe in extra-terrestrials? 阿瑟爵士相信外星人吗？
2. You could also mistake them, in the right light, with certain extra-terrestrials from any number of TV series, such as the X-Files. 在特定的光线下，你有可能会将它们误认作电视剧中的某种外形生物，例如像在《X档案》中的那样。
3. He created RACES of alien creatures, such as the Mercurian Harmoniums, a species of paper-thin extra-terrestrials who lived on sound. 他创造出一系列外星生物，诸如水星人哈摩里斯，一种以声音为食、身体薄如纸片、生活在大气圈外的物种。
4. The physicist Enrico Fermi famously asked why no extra-terrestrials have shown up on Earth when there are likely to be so many solar systems where life could have evolved. 物理学家恩里克·费米曾提出一个著名的问题：既然宇宙中有着海量的恒星系，其中有条件演化出生命的也为数不少，然而为什么到目前止还没有任何一个地外文明向地球人展示它们的存在？
