睡觉前一小时关掉孩子的电子设备。
Turn off you child's electronic devices an hour before bedtime.
29%的“隐形风险”人群在三项测试中得分较高：他们每天花在电子设备上的时间超过5个小时。
29%, the "invisible risk" group, scored high on three in particular: They spent five hours a day or more on electronic devices.
大约五年前，美国高三学生每天花在电子设备上的时间一般超过六小时。
Some five years ago, high school seniors in America generally spent more than six hours a day on electronic devices.
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