Mental development arrearage is in children period is discovered namely more.

精神发育迟滞多是在儿童时期即被发现。

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In such studies, researchers would need to follow groups of children with and without music lessons over a long period of time—even if the assignments are not completely random.

在此类研究中，研究人员需要在很长一段时间内对上音乐课和未上音乐课的不同小组的儿童进行追踪——即使任务并不是完全随机的。

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During this period, researchers interviewed nearly 3,000 women, some of whom had learnt to read as children, some during the literacy crusade and some who had never learnt at all.

在此期间，研究人员采访了近3000名妇女，其中有些人在小时候已经学会了阅读，一些是在扫盲远征运动中学会的，还有一些从未学过阅读。

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The researchers compared cotinine levels to behavioral problems that parents observed in the children during a 2-week period.

VOA: special.2009.01.13

The researchers studied the diets of thirty-one thousand children ages two to eighteen over a thirty-year period.

VOA: special.2010.03.17

They had six children over a seven-year period, four girls and two boys.

VOA: special.2010.04.18

Marish Children's Centre will be closed during the 48-hour period and Claycots Children's Centre will be closing early at 1615 BST.

BBC: Council staff strike in Berkshire

Other plans for the money include running sample 1940s school lessons, where children can dress in period costume and take part in gas mark drills.

BBC: NEWS | UK | Grants give pupils taste of WWII

The new FAQ document notes that insurance companies may establish an open enrollment period for children with pre-existing conditions and makes clear that the Administration will not hesitate to issue regulations if insurance companies unfairly limit access to insurance for children who need it most.

WHITEHOUSE: Health Care Blog | The White House