Chinese government is poised to conduct its first national survey of pollution sources in February to help control environmental deterioration in the country.

中国政府准备在2月份进行首次全国污染源调查，以帮助控制环境恶化。

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A case in point is the study by Linda Sax at UCLA, who used data from a large national survey of college freshmen to evaluate the effect of single-sex versus coeducational high schools.

加州大学洛杉矶分校的琳达·萨克斯的研究就是一个恰当的例子，她利用了一项全国性的大一新生调查来评估单性别高中和男女混合高中的效果。

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That was the finding of a national survey last year by the Pew Research Center.

这是皮尤研究中心(Pew Research Centre)去年一项全国性调查的结果。

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But a national survey found that in recent years foreign language teaching decreased in public elementary and middle schools.

VOA: special.2010.06.17

National Public Radio asked exactly this question in a survey a year or so ago and they got the following principal responses back.

国家公共广播电台问过,完全相同的问题,在一次一年前的民意调查中,他们得到了如下的回复

耶鲁公开课 - 聆听音乐课程节选

For the study, the researchers used the two thousand seven National Survey of Children's Health.

VOA: special.2010.05.06

Based on national survey data, it found a surprisingly high tolerance of wealth disparity.

ECONOMIST: Happiness and wealth

Meanwhile, a national survey is helping to plot dragonflies and damselflies on the map.

BBC: Rare dragonfly visitor at reserve

In a recent national survey in South Africa, 10% of sexually experienced young women said they had been raped.

ECONOMIST: Women and HIV