主題, 題目
the subject of a talk, a piece of writing, a person's thoughts, or an exhibition; a topic
主題曲, 主旋律
a melody that is repeated and developed in a piece of music
主題, 風格
a set of colors, styles, or images used in a particular design or context
以...為主題, 定主題
to give a particular theme to (a place, event, or piece of work)