trilogy

trilogy
(pl. -ies)
  1. a group of three related novels, plays, films, operas, or albums
    (小说、戏剧、电影、歌剧、唱片集的)三部曲
    Greek
    ■(in ancient Greece) a series of three tragedies performed one after the other
    (古希腊)悲剧三部曲
    ■(figurative)a group or series of three related things
    (喻)三连串事
    a trilogy of cases reflected this development.
    连续发生的三个相关事件反映了事态发展。
英语宝典
考试词汇表