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