According to WHO, cell phone use has become much more prevalent and it is not unusual for young people to use cell phones for an hour or more a day.

据世界卫生组织(WHO)统计，手机使用已经变得越来越普遍，对年轻人而言，一天使用一个小时手机甚至更长时间很平常。

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"Today, mobile phone use has become much more prevalent and it is not unusual for young people to use mobile phones for an hour or more a day, " the researchers wrote.

研究人员写道，“现如今手机使用越来越普遍，年轻人每天通话一小时及以上已不足为奇”。

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"Today, mobile phone use has become much more prevalent and it is not unusual for young people to use mobile phones for an hour or more a day, " the researchers wrote.

研究人员写道，“现如今手机使用越来越普遍，年轻人每天通话一小时及以上已不足为奇”。

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