The main topic of conversation was Tom's new girlfriend.

交谈的主要话题是汤姆的新女友。

《牛津词典》

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。

《柯林斯英汉双解大词典》

She kept skipping from one topic of conversation to another.

她一再转换谈话的话题。

《牛津词典》

and she comes to a very touchy, a very delicate topic of conversation and she perhaps hesitates.

当她谈论到一个有点敏感与微妙的话题时，她似乎有点犹豫要不要接着讲下去。

have to 课堂 - SpeakingMax英语口语达人

In Cardiff Bay the topic of conversation has gone from cuts and commissions to holiday plans.

BBC: Holiday reading? Look away now.

That's been a major topic of conversation between us and the U.K. over the prior months.

WHITEHOUSE: Press Briefing on Security Review

Consider two meetings in two parts of the world where the topic of conversation was the same.

NPR: Arab Delegation Takes Peace Proposal to Israel