求翻译：众所周知，网民数量是衡量互联网络发展的一项十分重要的指标。中国互联网络信息中心2006年1月的第17次调查显示，网民中18-24岁的年轻人所占比例最高，达到35 . 1 %，网民在结构上仍然呈现低龄化的态势。据统计，在2亿中小学生中，上网学生已达3000万，中小学生互联网渗透率达到15.4%，其中高中学生互联网渗透率已达半数以上。是什么意思？

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