dustpann.簸箕dustn.灰尘；尘土；粉尘vt.去掉 ... 的灰尘；撒粉末于vi.除尘dust-proof enclosure防尘罩dust exhaust apparatus吸尘装置dust reduction machine降尘器dust cycle coefficient占空系数dust discharging plate排粉盘dust-proof luminaire防尘灯dust absorption system吸尘系统dust off one's clothesn.丝毛刺头菊dust-pan shaped hole簸箕形孔Dust absorption effect滞尘效益