revolve around sb/sth
= to have someone or something as the main or most important interest or subject以...为中心；以...为主题；围绕...。
revolve verb [ I or T ]（使）旋转；（使）转动；（使）环绕，围绕。

【例句】
The conversation revolved around childcare problems.
这次会谈的中心议题是儿童保育方面的问题。

His whole life revolves around football.
足球是他生活的中心。