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- 问题详情：About20citiesinChinajoinedaworldwiderelayonSaturdaynighttohavethelightsofmajorbuildingsoffforonehourtoshowconcernsabouttheclimatechange．TensofthousandsofChinesepeoplealsoturnedofflightsandhouseholdappliances（家用电器）athomeorjoinedoutdooractivit...
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