In parts of South America, vitamin-A deficiency is a serious health problem, especially among children.

在南美部分地区，缺乏维生素 A 是一个严重的健康问题，尤其在儿童之中。

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Another aspect of this problem is controlling asthma among children in these groups.

这个问题的另一个方面是在这些群体的儿童中控制哮喘。

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"Many parents fear that their language is an obstacle, a problem, and if they abandon it their children will integrate better," says Antonella Sorace of the University of Edinburgh.

爱丁堡大学的安东内拉·索拉斯说：“许多父母担心他们的语言对孩子来说会是一个障碍、问题，如果他们放弃这种语言，他们的孩子会更好地融入社会。”

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This is a common problem for millions of children around the world and not just at school, but also at home.

VOA: special.2009.12.21

Piaget was really big into question and answer, but one problem with this is that children aren't very good with language, and this might lead you to underestimate how much they know.

皮亚杰非常热衷用问与答的方法进行研究,但这里存在的一个问题便是,儿童并未能完全掌握语言,这可能会导致你低估他们的理解能力

耶鲁公开课 - 心理学导论课程节选

He says many parts of the world are doing too little to correct the problem of lead poisoning in children.

VOA: special.2009.08.31

Living Maths gives young children fun problem-solving activities like bingo, math shows, that form the basis of learning math when they get older.

FORBES: Cape Town Science Centre Expands Math And Science Learning Hub In South Africa

They included the problem children of every neighborhood as well as students and factory workers.

NPR: Excerpt: 'World War II Writings'

But it is neither a school for problem children nor a tutoring service, she says.

BBC: "Good morning everyone," says the teacher.