导语：本文将分别以肯定回答和否定回答的角度来探讨arethese（复数形式）的问题。在这个全球化的时代，相互间的了解和交流显得格外重要。通过对这些问题的肯定与否定回答，我们可以更好地理解世界，促进共同发展。
一、肯定回答：
1.Arethesedigitaldevicesuseful?
Withtherapiddevelopmentoftechnology,digitaldeviceshavebecomeanindispensablepartofourdailylives.Fromsmartphonesandlaptopstotabletsandsmartwatches,thesedigitaldeviceshavegreatlyfacilitatedoureverydaytasks.Theyprovideuswitheasyaccesstoinformation,enhancecommunication,andincreaseproductivity.Moreover,digitaldeviceshavealsoopenedupnewopportunitiesintermsofeducation,entertainment,andbusiness.Forexample,e-learningplatformsenableustoacquireknowledgeanytimeandanywhere,whilestreamingservicesallowustoenjoyawiderangeofmoviesandmusic.Therefore,itisundeniablethatthesedigitaldevicesareindeeduseful.
2.Aretheseinternationalconferencesbeneficial?
Intoday'sinterconnectedworld,internationalconferencesplayavitalroleinpromotingglobalcooperationandunderstanding.Theseconferencesbringtogetherexperts,scholars,andprofessionalsfromdifferentcountriesandfieldstoexchangeideas,discussimportantissues,andinitiatecollaborations.Bysharingtheirinsightsandexperiences,theseconferencescontributetotheadvancementofknowledgeandinnovation.Additionally,internationalconferencesoftengeneratesignificanteconomicbenefitsforthehostcountry,suchasincreasedtourismandbusinessopportunities.Furthermore,theyprovideaplatformforcountriestostrengthendiplomaticrelationsandresolveconflictsthroughdialogue.Therefore,itcanbeconcludedthattheseinternationalconferencesarehighlybeneficial.
二、否定回答：
1.Arethesedigitaldevicesharmful?
Whiledigitaldeviceshaveundoubtedlybroughtnumerousbenefits,therearealsopotentialdrawbacksthatweneedtoacknowledge.Excessiveuseofdigitaldevicescanleadtovarioushealthissues,suchaseyestrain,musculoskeletalproblems,andsleepdisturbances.Moreover,dependenceondigitaldevicesmayhinderface-to-faceinteractions,resultinginsocialisolationandreducedemotionalintelligence.Inaddition,theproliferationofdigitalmediahasraisedconcernsaboutprivacyandsecurity,aspersonalinformationcanbeeasilyaccessedandexploited.Therefore,itisimportanttousethesedigitaldevicesinmoderationandtakeappropriatemeasurestoprotectourwell-beingandprivacy.
2.Aretheseinternationalconferenceswasteful?
Althoughinternationalconferenceshavetheirmerits,criticsarguethattheycanbewastefulandineffectiveinachievingtheirintendedgoals.Thehighcostsassociatedwithorganizingandattendingtheseconferences,includingtravelexpensesandaccommodation,canplaceaburdenonbothparticipantsandhostcountries.Moreover,thereisoftenalackoffollow-upactionorimplementationoftheideasandresolutionsdiscussedduringthesegatherings.Criticsalsopointoutthatsomeconferencesmayserveasmereplatformsforself-promotionratherthangenuineknowledgeexchangeandproblem-solving.Therefore,itisnecessarytoreevaluatethepurposeandeffectivenessoftheseinternationalconferencesandensurethattheyareconductedinacost-effectiveandresult-orientedmanner.
结语：通过对arethese问题的肯定与否定回答的探讨，我们可以看到事物的多面性。数字设备和国际会议都有其优点和局限性，我们应该充分利用其优势并采取措施来解决潜在的问题。在不断发展的世界中，求知和合作是推动各国共同发展的重要因素，我们应该以积极和开放的心态面对这些问题，并努力在日常生活和社会中做出明智的选择。
