It's not unusual for children to sulk or throw a tantrum when parents demand they switch off the television or put down the phone, but for parents, what's on that screen -- or how long a child has been staring at it -- is the bigger worry.
원문출처 : http://www.cnn.com/2017/11/15/health/screen-time-averages-parenting/index.html
원문출처 : http://www.cnn.com/2017/11/15/health/screen-time-averages-parenting/index.html