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Beijingishardlyaloneinitsairpollutionproblems.TheworldH...
问题详情:Beijingishardlyaloneinitsairpollutionproblems.TheworldHealthOrganizationhassaidthatroughlyhalfoftheworld’surbanpopulationisexposedtopollutionatleast2.5timeshigherthanitrecommends.Whileitmayta...