The Chinese actions on rare earths were a prime topic of conversation at a conference here on Thursday that was organized by Metal-Pages, an industry data firm based in London.

周二，基地在伦敦的工业数据公司——英国金属网组织的一次会议上，中国对稀土控制成了最热门的话题。

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The Mersenne prime distribution is a very difficult topic in mathematics.

梅森素数分布研究是数学中的一大难题。

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Economics students were grilled on the topic of 'the sub-prime mortgage crisis' and hopefully came up with some good solutions to the problem.

申请经济专业的考生被“拷问”了“次贷危机”的问题以及可能的解决方案。

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The issue of BP's preparedness is sure to be a prime topic at the hearing, according to Senate staffers.

WSJ: BP's Preparedness for Major Crisis Is Questioned

It is an indication of just how sensitive a topic the doughty prime minister has chosen to confront.

CNN: Mahathir's Worldly Concerns

Calls to make Singapore more conducive to bigger families had been echoing through the island since Prime Minister Goh Chok Tong brought the topic up yet again in his National Day Rally message in late August.

CNN: In the Grip of a Virus