In a study, researchers gave three groups of six-year-old children a difficult task to complete on a computer.

在一项研究中，研究人员给三组六岁的儿童安排了一项困难的任务，让他们在电脑上完成。

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A new study has found that most three-year-old children can remember a lot of what happened to them a year earlier, and these memories are still clear while they are 5 and 6, but by the time they are over 7, these memories become weaker rapidly.

一项新的研究发现，大多数三岁的孩子都能记得很多一年前发生在他们身上的事情，在他们5岁到6岁的时候，这些记忆仍然清晰，但当他们超过7岁时，这些记忆就会迅速变弱。

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One famous experiment in the 1960s involved 3- to 6-year-old children.

20世纪60年代，在3到6岁的儿童中开展了一项著名实验。

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It was founded by DeWitt and Lila Wallace, both 32-year-old children of preachers.

VOA: standard.2010.03.08

And this report also mentioned that half of...almost half of India's children 3 to 5 years...under 3 to 5 years old are mal-nourished? -Yes.

这篇报道还提到,3到5岁的,印度孩子中大概有一半,都是营养不良的？，-对。

普林斯顿公开课 - 国际座谈会课程节选

People who grew up listening to it are now old enough to listen with their own children, or even their grandchildren.

VOA: special.2009.10.08

Fun Zone's play scheme at Lings Forum in Northampton was open for nine to 13-year-old children.

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In 1947, almost all 11-year-old children attending school in Scotland were given intelligence and mental-health tests.

WSJ: Exercise Might Beat Puzzles for Protecting the Aging Brain

But this is not just any old neighbourhood, and these aren't just any old children.

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