ADutchartistanddesignerhascomeupwithadevicewhichhehopes...
問題詳情：ADutchartistanddesignerhascomeupwithadevicewhichhehopeswillgetridofpollutantsfromBeijing'ssmogskies,creatingcleanairforthecity'smask-wearingpeople.Anelectromagneticfield（電磁場）willpullparticl...