coal dust

基本解释

She called down something about coal dust and sawdust, someone called back up to her, and she laughed.
她朝楼下说了一句煤灰和锯屑的话，有个人回了她一句，她发出笑声。
In the rugged south of Shanxi province, the water in the mountain streams was now black with coal dust and undrinkable.
在崎岖的山西南部，山里的水已经不能喝了，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.
因为有通风设备往里面输送新鲜空气，还有洒水器不断地给煤浇水以降温，所以地下既阴冷又潮湿。

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

煤尘
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.
由于试验中瓦斯量较小，瓦斯爆炸在此过程中主要有两个作用：扬起煤尘；点爆煤尘。
煤粉