national standard age classification [统计] 国家标准年龄分类
Standard International Age Classification 国际标准年龄分组
bone age classification 骨龄分类
character classification by age 年龄分类
classification of age 按年龄分组
age classification
年龄分类
以上为机器翻译结果，长、整句建议使用 人工翻译 。
"Ending the exemptions from age classification for hard copy music videos will be an important step forward in making sure that children are not inadvertently exposed to unsuitable material, " said Mr Bailey.
BBC: Age-ratings call for music DVDs
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