![Itwasoncethoughtthatairpollutionaffectedonlytheareaimme...]( "Itwasoncethoughtthatairpollutionaffectedonlytheareaimme...")
- 問題詳情：Itwasoncethoughtthatairpollutionaffectedonlytheareaimmediatelyaroundlargecitieswithfactoriesand/orheavyautomobiletraffic.Today,weknowthatalthoughthesearetheareaswiththeworstairpollution,theproblemisliterallyworldwide.Onseveraloccasionsoverthe...
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