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Itwasoncethoughtthatairpollutionaffectedonlytheareaimme...
问题详情:Itwasoncethoughtthatairpollutionaffectedonlytheareaimmediatelyaroundlargecitieswithfactoriesand/orheavyautomobiletraffic.Today,weknowthatalthoughthesearetheareaswiththeworstairpollution,thepro...