In many countries, legal as well as social and cultural barriers prevent groups at risk from receiving the interventions and knowledge needed to reduce harmful behaviours.

在许多国家，法律以及社会和文化壁垒妨碍风险群体获得必要的干预措施和知识以减少有害行为。

youdao

It can be seen that certain groups are more at risk than others.

看得出，有的组风险大，有的组风险小。

《牛津词典》

If individuals on the edge of a group are more vigilant because they are at greater risk of being captured, then individuals on average would have to be more vigilant in smaller groups.

如果处于群体边缘的个体由于被捕获的风险更大而变得更加警惕，那么个体通常在较小的群体中就必须更加警惕。

youdao

And they are advising against travel by children, pregnant women and other groups at highest risk.

VOA: special.2009.11.24

You can see that when you get out to the highest groups here, the highest weights, the relative risk is up at two and a half or three, so that would be a 200% increase in risk for cardiovascular death or two to three times the risk of death.

当我们看图上相对风险最高的这组,也就是体重最大的这组,这组的相对风险大约是2.5倍到3倍,即心血管疾病致死的风险增加了200%,或者说增加了2到3倍

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

She says children are at risk of sexual violence, killing and maiming, and forced recruitment into armed groups.

VOA: standard.2010.02.04

Children and young adults up to age 24 are one of the groups at high risk for severe complications of the H1N1 flu.

CNN: CDC: Fewer states seeing widespread flu activity

Scientists say it isn't clear whether the drug will work for all groups at high risk of infection because the virus enters the body in different ways in each case.

WSJ: Daily Pill Slashes Risk of HIV Infection in Study

And that's not the only modern first for the NHS. This winter the NHS will be the world's first health service - indeed the world's only - health service capable of providing the new meningitis vaccine to the groups most at risk.

BBC: News | UK Politics | Frank Dobson's speech in full