You can talk about some classic topics: food, coffee (such as talking about Simbach, whose first store is located in Seattle, USA), movies (the Oscar-nominated film has just come out), British and American universities (Ivy League) ), tourist attractions, bar culture (especially in the UK),,,

Or more professional: more authoritative English tests in China (learn about it yourself by the way), favorite British and American writers (such as Jane Austen, Life and Life and works, etc., you can talk about it for a long time), the differences in Chinese and English translation between familiar proverbs and idioms, or introduce several must-read books in British and American countries (such as the Bible, ancient Greek mythology, Shakespeare's plays)