/dʌst ||; dʌst/noun [U] very small pieces of dry dirt, sand, etc in the form of a powder 尘埃；灰尘: a thick layer of dust厚厚的一层灰尘chalk/coal dust粉笔末；煤尘The tractor came up the track in a cloud of dust.拖拉机开上小路，扬起一团尘埃。a speck (= small piece) of dust一点灰尘 ➔dustyadjThis shelf has got very dusty.这块搁板积满了灰尘。
*dust²
/dʌst ||; dʌst/verb [I,T] to clean a room, furniture, etc by removing dust with a cloth 用布把灰尘抹去 · Let me dust those shelves before you put the books on them.我把书架抹干净以后你再放书。☞Look at the note at clean ². 参看clean^2的注释。