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

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

A challenge that affects parents, children and citizens in almost every community in America should not be a Democratic problem or a Republican problem.

VOA: special.2010.08.12

Some times I tell my children to cooperate to solve a problem.

VOA: special.2009.08.30

"The problem we have at the moment is for us to be able to reach those families and those children that are in those communities, sometimes in remote spaces where we cannot have access,"

VOA: standard.2009.07.03