dry powder consisting of extremely small bits of dirt that is in buildings on furniture, floors etc if they are not kept clean

灰尘，尘埃:

All the furniture was covered in dust .

所有的家具都蒙上了灰尘。

a thick layer of dust

厚厚的一层灰尘

There's not a speck of dust in the kitchen.

厨房里一尘不染。

Her old trophies were collecting dust on the shelves.

她的旧奖杯在书架上起了灰尘。

Dust particles floated in the sunlight.

阳光里飘浮着尘粒。

A sudden breeze sent motes of dust (=small bits of dust) dancing in the air.

突然刮起一阵微风，吹得灰尘飞扬。

dry powder consisting of extremely small bits of earth or sand

沙土，尘土:

The wind was blowing dust and leaves up from the ground.

风把尘土和树叶从地上吹起来。

A car sped past in a cloud of dust .

一辆汽车在一片尘埃里疾速驶过。

powder consisting of extremely small bits of a particular substance

粉末，粉尘:

a dust, [BrE] the act of dusting something

掸灰，去尘:

I need to give the sitting room a dust .

我要把起居室的灰尘掸一掸。

let the dust settle / wait for the dust to settle, to allow or wait for a confused situation to become clear

让尘埃落定/等待情况明朗

[I,T] to clean the dust from a surface by moving something such as a soft cloth across it

擦（…的灰尘），打扫:

Rachel dusted the books and the bookshelves.

雷切尔给书和书架擦灰尘。

I was dusting in the bedroom when the phone rang.

我正在卧室里打扫，电话铃响了。

also dust down, dust off [T] to remove something such as dust or dirt from your clothes by brushing them with your hands

〔用手〕掸（…的灰）:

He got to his feet and dusted his knees.

他站起来拍拍膝上的灰尘。

Corbett dusted himself down and walked off.

科比特掸掸身上的灰走开了。

[T] to put a fine powder over something

将〔粉状物〕撒于:

Dust the biscuits with icing sugar.

把糖粉撒在饼干上面。