dustoorn.习惯(惯例)dustn.灰尘；尘土；粉尘vt.去掉 ... 的灰尘；撒粉末于vi.除尘dust extraction fan除尘风扇dust collection box集尘箱dust removal system除尘系统dust - collecting除尘dust exhausting fan排尘风扇dust-cleaning fan除尘风机dust someone's coatdust guard retainer防尘板槽盖dust cycle capacity断续负载容量dust collecting bag除尘布袋