Studies show that people use approximately one fifth less energy when they are billed for exactly what they use.

研究表明，当人们按实际使用量付款时，他们使用的能源大约减少了五分之一。

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Six months out, more people who had quit abruptly had stuck with it—more than one-fifth of them, compared to about one-seventh in the other group.

六个月后，选择突然戒烟的人中有超过五分之一的人坚持了下来，而另一组只有七分之一。

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The people in southern France, even though they eat fatty food, they get almost one-fifth the rate of heart attacks as, let's say, the Finnish people who also eat fatty food.

艾维瑞姆引述了所谓的“法国悖论”，“法国南部的人们即使常吃高脂肪食物，但他们心脏病发作几率却只有五分之一，我们还要说的是，芬兰人也经常吃高脂肪食物。

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They have predicted that up to one fifth of the Australian population about four million people could be infected by the swine flu virus.

VOA: standard.2009.05.30

One fifth of people living in Catalonia were born in other parts of Spain.

BBC: Spain regions: Uncharted waters for Catalonia

The Education for All Global Monitoring Report 2012 calculates that one fifth of young people aged 15 to 24 years in all developing countries around the world have not even completed primary skills and lack skills for work.

UNESCO: Twenty percent of young New Yorkers out of school and out of work | United Nations Educational, Scientific and Cultural Organization

But more than one-fifth of the people surveyed, 21 percent, said there was too little suspicion.

CNN: Survey: Shock from terror attacks receding