coal dust

基本解释

She called down something about coal dust and sawdust, someone called back up to her, and she laughed.
她朝樓下說了一句煤灰和鋸屑的話，有個人廻了她一句，她發出笑聲。
In the rugged south of Shanxi province, the water in the mountain streams was now black with coal dust and undrinkable.
在崎嶇的山西南部，山裡的水已經不能喝了，黑乎乎的跟煤混在一起。
The ground is cold and moist, with the chill factor amplified by ventilation fans used to blow fresh air into the mine, and the sprinkler that keep the coal dust down.
因爲有通風設備往裡麪輸送新鮮空氣，還有灑水器不斷地給煤澆水以降溫，所以地下既隂冷又潮溼。

Nor could anyone help but notice that the approval came wrapped in coal dust.
FORBES: Magazine Article
Miners, their faces still streaked with coal dust, gathered for supper in Charity's cozy kitchen along with the family.
NPR: Beans and Cornbread: Feeding Souls a Mile Deep
Enveloped in a smog of coal dust that softens the sunlight into a hazy glow is the An Tai Bao surface coal mine.
FORBES: Squash The Caterpillar

煤塵
Because gas capacity is small in the experiment, gas explosion in this process has two main roles: blowing coal dust and igniting coal dust explosion.
由於試騐中瓦斯量較小，瓦斯爆炸在此過程中主要有兩個作用：敭起煤塵；點爆煤塵。
煤粉