topic

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柯林斯词典

topic /ˈtɒpɪk/ (topics)

1. N-COUNT A topic is a particular subject that you discuss, study, or write about. 话题
The weather is a constant topic of conversation in Alaska. 天气在阿拉斯加是一个永恒的交谈话题。

剑桥词典

We seem to have exhausted this topic of conversation .
An article on this topic would once have been considered off limits .
Picking up the threads of our discussion , let's return to the topic of factory farming .
I'd like to steer our discussion back to our original topic.