A topic, a subject, or an area of academic interest or specialization.

主题，范围一个题目、课题或学术兴趣或专业领域。

youdao

As a noun, the main area of interest treated in a work, esp. written: a book on the subject of love.

作名词，著作中的主题思想，尤其是在书面作品中，汉语表述“主题、主体、题材”：一本以爱情为主题的书。

youdao

A topic, a subject, or an area of academic interest or specialization.

一个题目、课题或学术兴趣或专业领域。

youdao

Consequently, Israeli Wars became a subject of great interest in the area of international affairs.

FORBES: The Ghost Of Yom Kippur, Israel's Pearl Harbor

As summer ice in the Arctic has declined in recent years, the area has become the subject of intense interest from oil and gas companies.

BBC: Concerns raised over 'useless' Arctic oil spill plan