dustragn.防尘布dustn.灰尘；尘土；粉尘vt.去掉 ... 的灰尘；撒粉末于vi.除尘dust removal unit除尘机组dustless unloader无尘下装dustless drilling无尘钻眼dust control pipe除尘管道dust-collection除尘dust exhaust hood除尘罩Dusting mechanism扬尘机理dusting-powders扑粉dust-free plant无尘车间Dust emission rate起沙通量