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。