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。

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.

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发表在三份全国性报纸的这项调查显示，在该国遭受毁灭性的地震与海啸一个月之后，日本民众正在失去耐心。

The polls, published in three national newspapers, suggest that Japanese people are losing patience, more than a month after the country was hit by a devastating earthquake and tsunami.

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星期一公布的一个全国性的民意调查显示，大多数美国人支持结束这个禁令。

A nationwide poll released Monday found a majority of Americans support ending the ban.

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