It may have been the closest that humankind has ever come to encountering extraterrestrials.这可能是人类最近地遇到外星球生物.I figured why search for extraterrestrials when you can help with research?当你可以帮助科学研究时,为什么要寻找外星生物 呢 ?The existe...

n.外星人( extraterrestrial的名词复数 )...

extraterrestrials的音标：...