theme
/θi:m; θim/ n[C]
1 subject of a talk, a piece of writing or a person's thoughts; topic （谈话或写作的）主题; （某人观念的）核心; 题目
The theme of our discussionwas `Europe in the 1980's'. 我们讨论的题目是｀八十年代的欧洲＇.
2 (music 音) melody that is repeated, developed, etc in a composition, or on which variations are composed （乐曲的）主题, 主旋律.
3 (US) (subject set for a) student's essay or exercise 学生的作文或练习（题目）.