They are considered a high-risk group.

他们被视为高风险群体。

《牛津词典》

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Another high risk group is children.

另一个高危群体是儿童。

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Deborah Sigmund started a group called Innocents at Risk.

VOA: special.2010.06.14

What this does, when you use relative risk you take some group of the population and you establish their risk as--at one.

当运用相对危险度这个概念时,要选定一个群组,并把这个群组的风险设为1

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

You just say that arbitrarily this group, the reference group, let's say the group with the lowest weights, or the lowest cholesterol or anything, you say their risk is one, and then you look to see how everybody else's risk is compared to that.

可以随意地设定一个群组,作为参照组,我们可以假设是体重最低的一组,或者胆固醇水平最低的一组或者其他,将参照组的风险设为1,然后就可以比较参照组与其他组的风险

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

But it isn't clear yet how many of the 7, 000-strong at-risk group have now been fully vaccinated.

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They were scanned again two years later and a fifth of the at-risk group had developed major depression.

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Individuals with certain birth defects of the heart that have not been completely repaired also fall into this higher-risk group.

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