Like indigenous groups and poor communities around the world, Australia's Aborigines are considered to be more vulnerable to the H1N1 flu than other groups because they suffer higher rates of chronic disease.

VOA: standard.2009.07.24

They start to talk about who's most susceptible in the population; who were the most vulnerable groups; and if you're going to do intervention, who you may want to focus your efforts on.

人们开始讨论哪些人是最易受到影响的,哪些是最脆弱的群体,如果要进行干预,应该把注意力集中在哪些人身上

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 experts say they are encouraged that the virus seems to be hitting hardest among people of middle age, sparing the more vulnerable groups - the elderly and children under the age of five.

VOA: standard.2009.04.28