subject
/ˈsəbʤɪkt/
the subject matter of a conversation or discussion
中文释义：话题；主题
The professor changed the subject when the discussion became too heated.
当讨论变得过于激烈时，教授转移了话题。
Climate change is a subject that requires urgent global attention.
气候变化是一个需要全球紧急关注的话题。