backstory

英 [ˈbækstɔːri] 美 [ˈbækstɔːri]

n.  (电影、小说等的)幕后故事,故事背景

COCA.33892



牛津词典

noun

  1. (电影、小说等的)幕后故事,故事背景
    the things that are supposed to have happened before the events in a film/movie, novel, etc.