鋼鉄都市
Robots and Empire is a science fiction novel by the American author Isaac Asimov, published by Doubleday Books in 1985. It is part of Asimov's "Robot" series, which consists of many short stories (collected in "I, Robot", "The Rest of the Robots", "The Complete Robot", "Robot Dreams", "Robot Visions", and "Gold") and five novels (including "The Positronic Man", "The Caves of Steel", "The Naked Sun", and "The Robots of Dawn").