The study is open to all children aged 12 and under.

这项调查对所有12岁及12以下的孩子公开。

youdao

A school immunisation programme began last month for all girls aged 12 and 13.

上月英国一项学校免疫计划启动，将为12、13岁的所有女孩作免疫接种。

youdao

These recommendations are relevant to all healthy children aged 5–17 years unless specific medical conditions indicate to the contrary.

这些建议涉及所有健康的5–17岁儿童，除非有特殊健康状况表明其不适宜。

youdao

Aron Journet, Gemma Turner, Hannah Gunning and Marc Godfrey - all aged nine when they entered - from Sutton at Hone Church of England Primary in Dartford, Kent took the award for best play.

BBC: Girls show writing flair

The 51 passengers - who were all aged around 25 - were on their way home from Alpe d'Huez after finishing their ski season working for Skibound in various resorts across the French Alps.

BBC: UK

In Tanzania, less than half of all primary school-aged children were in school at the beginning of the decade.

UNESCO: CULTURE