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- 問題詳情：About20citiesinChinajoinedaworldwiderelayonSaturdaynighttohavethelightsofmajorbuildingsoffforonehourtoshowconcernsabouttheclimatechange．TensofthousandsofChinesepeoplealsoturnedofflightsandhouseholdappliances（家用電器）athomeorjoinedoutdooractivit...
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