subject matter

US /ˈsʌbdʒekt ˌmætər/
UK /ˈsʌbdʒekt ˌmætər/
"subject matter" picture
1.

主題, 題材

the topic or theme of a book, discussion, or work of art

:
The subject matter of the painting was a landscape.
這幅畫的主題是風景。
The professor's lecture covered a wide range of subject matter.
教授的講座涵蓋了廣泛的主題