I couldn't follow the talk because he kept jumping about from one topic to another.

我听不明白他的讲话，他老是转换话题。

《牛津词典》

The topic of this speech is about action.

这次演讲的主题是关于行动的。

youdao

For example, Russian, French, and Spanish persons may use silence to show agreement between parties about the topic under discussion.

例如，俄罗斯人、法国人和西班牙人可能会用沉默来表示双方对正在讨论的话题达成一致。

youdao

Now, in thinking about this question, this is-- you might think of the topic as the nature of wellbeing.

思考这个问题时-,你们会可能想到幸福的本质话题。

耶鲁公开课 - 死亡课程节选

We look at what emails you reply to if you reply in theory that suggests this user must care about whoever sent this email or the topic they are in.

我们看看哪些邮件要回复,如果你回复了,理论上来说这表明了用户一定很关心,发件人以及邮件的主题。

哈佛公开课 - 计算机科学课程节选

So let's turn our attention to a new topic, which is thinking a little bit about the periodic table, and also talking about periodic trends.

我们的新主题上，我们将会讨论一点关于元素周期表的知识，同时也会讲一讲周期性规律。

麻省理工公开课 - 化学原理课程节选

On Tuesday morning I had an opportunity to speak at the 2011 TEAMS Conference in Las Vegas about the topic of economic impact.

FORBES: Educating Sports Commissions and CVBs About the Economic Impact of Sports

Imagine that one of the documents about the same event or topic that is clustered together broadens their reporting to include more details, including information about other people or places or things that was involved.

FORBES: Patent Application Reveals Key Factors In Google News Algorithm

This process starts to uncover the underlying beliefs, assumptions, and meanings others have about the topic under discussion.

FORBES: How to Stop the Dreaded "Decision Drift"