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原文：Opinionsontheeffectsofchildren’sdigitalmediahabitsaredeeplypolarised.Atoneextreme,JeanTwenge,apsychologyprofessoratSanDiegoStateUniversity,saysthesmartphonehasradicallychangedthelivesofthegenerationofAmericanchildrenbornbetweenand,wherevertheyliveandwhatevertheirbackground.Shethinksexcessiveuseoftheinternetandsocialmediamakesthemlonelyanddepressedandposesseriousriskstotheirphysicalandparticularlytheirmentalhealth,sometimestothepointofdrivingthemtosuicide.Othersnotethatsimilarwarningsweresoundedwhentelevisionstartedtospreadinthesecondhalfofthe20thcentury.Atthetimeitwaswidelybelievedthatifchildrenspentlonghourswatchingiteveryday,theywouldbe