He spoke with authority on the topic.

他就这个课题发表权威意见。

《牛津词典》

Teaching methodologies vary according to the topic.

教学方法因题目而不同。

《柯林斯英汉双解大词典》

No one article can ever do justice to the topic of fraud.

没有一篇文章能恰如其分地处理欺诈这一主题。

《柯林斯英汉双解大词典》

The topic came up during a recent meeting in Washington between U.S.President Barack Obama and his Russian counterpart Dmitri Medvedev.

VOA: standard.2010.07.05

And so they're coming at the text already with some kind of familiarity with the topic, at least in a popular conception.

所以他们阅读文本时,对这个话题其实早已有所了解，至少了解大众观点。

耶鲁公开课 - 新约课程节选

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

Then again, the topic has been a sticking point in the campaign of late.

NPR: Obama, McCain Speak At Community Service Forum

Sometimes doctors are concerned about alienating patients by bringing up the topic of fertility.

WSJ: More Doctors Broach Subject of Women's Age and Fertility

Why do you introduce the topic of who is greedy and who is not greedy?

FORBES: Jerry Della Femina, the "Mad Men" Ad Man, Has Shrugged