staple of conversation

• 主要话题

staple of conversation的用法和样例：

例句

1. Football is his main topic of conversation.
   足球是他的主要话题。
2. At a private Australian Chamber of Commerce dinner held in Beijing on Wednesday night with former foreign minister Alexander Downer, Mr Hu was the main topic of conversation.
   周三晚在北京和前外长唐纳一起参加一家私人澳洲商会举行的晚宴，胡士泰事件是主要话题。