Turning to the U. S. this topic, saying: beauty is human nature.

谈到美这个话题，常言道：爱美是人的天性。

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Today? S topic will focus on indoor air pollutants, their sources, as well as mitigation methods.

今天的主题就是要讨论室内空气污染的来源及如何减低室内空气污染。

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Unfortunately, given space limitation, I'll only cover the most important elements relevant to this article? S topic.

遗憾的是，由于空间所限，我将仅介绍与本文主题相关的最重要元素。

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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

That's what I wanted to say in finishing up last week's topic of DNA technology.

现在我已经把,上周DNA技术剩下的部分讲完了

耶鲁公开课 - 生物医学工程探索课程节选

And this is going to sound like a weird topic, we're going to see why it's of value in a second.

这听起来像个怪异的主题，我们将会去学习一刹那。

麻省理工公开课 - 计算机科学及编程导论课程节选

Though I am a team player, this week's topic has nothing to do with my employer.

CNN: Apparently This Matters: Bracket Town

Before we begin discussing this morning's topic, I want to congratulate Japan on the superb job it did in hosting APEC in 2010.

WHITEHOUSE: President Obama Welcomes Leaders at APEC Summit

The rest of the debate focused on the night's topic, foreign affairs, and proved that both men could pronounce the names of foreign leaders -- for the most part.

CNN: Commentary: Gambler McCain survives a wild week