ADutchartistanddesignerhascomeupwithadevicewhichhehopes...
问题详情：ADutchartistanddesignerhascomeupwithadevicewhichhehopeswillgetridofpollutantsfromBeijing'ssmogskies,creatingcleanairforthecity'smask-wearingpeople.Anelectromagneticfield（电磁场）willpullparticl...