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- 问题详情：Thelongerateenagerspendsusingelectronicdevicessuchascomputersandsmartphones，theworsetheirsleepwillbe，astudyofnearly10，00016-to19-year-oldssuggests．Morethantwohoursofscreentimeafterschoolwasstronglylinkedtobothdelayedandshortersleep．Almostallthetee...
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