About20citiesinChinajoinedaworldwiderelayonSaturdaynigh...
问题详情：About20citiesinChinajoinedaworldwiderelayonSaturdaynighttohavethelightsofmajorbuildingsoffforonehourtoshowconcernsabouttheclimatechange．TensofthousandsofChinesepeoplealsoturnedofflightsandhouse...