中国近七分之一的地区一直处于重度雾霾之下。
Almost a seventh of China has been under heavy smog.
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七分之一的人没有足够的食物。
About one in seven humans do not get enough food.
今天，地球上七分之一的人口生活在贫民区。
One in seven people on Earth lives in slums today.
他有七分之一的机会在七十八岁生日前患上肺癌。
He has a 1-in-7 chance of getting lung cancer by his 78th birthday.
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