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- 問題詳情：ADutchartistanddesignerhascomeupwithadevicewhichhehopeswillgetridofpollutantsfromBeijing'ssmogskies,creatingcleanairforthecity'smask-wearingpeople.Anelectromagneticfield（電磁場）willpullparticles（微粒）inthesmogtothegroundwheretheycanbeeasilyclea...
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