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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I also want to note that the end of the material today, so this last topic here, that's the end of the material that's going to be on this first exam.

我还想告诉大家，今天这些内容结束的地方，这个最后的主题，也就是第一次考试,要考到的地方。

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And that's what we're going to spend today on, is talking about that topic. I'm going to use it to build over the next couple of lectures.

我们今天也是讲这些内容，而且这些内容,将贯穿我们下面几节课。

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Anyway, I want then to move on to the topic of today's lecture, Insurance is the other side of the risk management institutions that we have.

下面开始今天这节课的主题,保险是我们现有的另一种,风险管理制度

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Today's topic will be finding sources.

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And, David, concern over North Korea was a major topic during today's talks, I gather.

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Finally, whenever the topic of limiting tests is raised in today's partisan environment, the specter of rationing is often brought up.

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