subject matter

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

主题, 题材

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

:
The subject matter of the painting was a landscape.
这幅画的主题是风景。
The professor's lecture covered a wide range of subject matter.
教授的讲座涵盖了广泛的主题