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     SmoginEuropeandNorthAmericacouldbemorethan25timesm...

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  • 問題詳情：     SmoginEuropeandNorthAmericacouldbemorethan25timesmoredeadlythantheaverageairpollutionfoundinChinesecities,anewstudysuggests.Inthelargesteverstudyofitskindinthedevelopingworld,researcherstestedtheeffectsofairpollutiononthehealthofpeo...
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