Try to say something though when the topic changes.

所以，一旦话题变化，就试着说些什么吧。

youdao

If the topic changes, change the subject line to match it.

如果邮件中所谈的主题变了，改变标题使其匹配。

youdao

You will definitely want to carefully review the official documentation and get a comprehensive list of the changes. What you will discover is that most of the topic changes apply to the written exam.

你一定会仔细查看官方文档并查看完整的考题变化列表，但你会发现大部分考点的变化都在笔试上。

youdao

Facebook will enact a vote on changes to its governance when more than 7, 000 comments have been made by users on a topic.

BBC: Facebook offers control to users

Dinaburg said he became interested in this topic last year at Black Hat when a friend, Robert Edmonds, and Paul Vixie presented on a study of changes observed within the domain name system (DNS).

FORBES: Bitsquatting: Machine-Garbled Internet Connections