"They get spoiled and cannot concentrate on any one thing long enough to learn from it," said Lerner, a childhood development researcher.

“他们被宠坏了，无法长时间专注于一件事，也无法从中学到什么。”一名叫雷纳的儿童发展研究员说。

They point out that free-time activities play an important role in childhood development and that large amounts of homework reduce children's free time, hindering their development.

他们指出，业余活动在儿童发展中发挥着重要作用，大量的家庭作业减少了孩子的业余时间，阻碍了他们的发展。

It is an important part of childhood development and learning to be polite.

这是童年成长和学习礼貌的重要内容。

Do you have any formal early childhood development or childcare training?

你是否曾有过一些儿童早期发育或是育儿方面的专业培训？

Infant and young child feeding is a cornerstone of care for childhood development.

婴幼儿喂养是儿童期发育保健的基础。