科幻文学在欧美国家源远流长,涉及的题材更是多种多样,可以说有多少门科学技术,就有多少种科幻小说。而其中有些领域格外受到垂青,久盛不衰。下面将一些特别活跃的题材予以简略介绍。(以后本刊将就这些题材精选部分作品发表,以飨读者。——编者) Science fiction literature in Europe and the United States has a long history, the subject involved is even more diverse, we can say how many science and technology, how many kinds of science fiction. Some of these areas are particularly favored, long prosperous. Below will be some particularly active subject to a brief introduction. (Later, we will publish selected works on these topics to readers.) - Editor)