Combined surveying stoma types of dicotyledonous plants survey of bacteria pollution in the air, investigating learning ways and routes were explored in biological scientific movements.

结合《双子叶植物气孔类型观察》和《空气中细菌污染的监测》活动项目，探索生物科技活动中研究性学习的方法和途径。

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Let's make a survey of air pollution next week.

我们下周去做一个空气污染的调查吧。

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The data comes from a county-by-county analysis of toxic air pollution released today in a survey known as the National air Toxics Assessment (NATA).

这个数据来自于今天公布的一份逐州的有毒空气污染的分析，它是在一项被称为国家空气毒物评估(NATA)的调查之中作出的。

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Beijing ranks second worst out of 31 mainland cities for air pollution in a survey based on government data by Friends of Nature, a non-governmental green group, The Beijing News reveals.

BBC: China media: Analysing North Korea

Farms are encouraged to volunteer for a federal EPA survey of air pollution in exchange for partial immunity from prosecution for infractions.

FORBES: Magazine Article