此外，除iPhone外，苹果亦推出了其他产品，iOS12系统还特别添加了名为「屏幕使用时间(Screen Time)的「家长控制糢式功能，帮助家长引导孩童更合理使用手机。 当前全球的智能手机用户更新手机的速度已放缓，据Gartner Inc.
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然而，屏幕使用时间越长，幸福感越低。
However, higher doses of screen time were clearly associated with lower happiness.
人们普遍认为，屏幕使用时间过长是当今年轻人不快乐的原因。
Too much screen time is widely believed to be the cause of unhappiness among today's young people.
也许父母们可以不再那么担心屏幕使用时间，至少对年龄较大的男孩和女孩来说是这样。
Perhaps parents can stop worrying so much about screen time, at least for older boys and girls.
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