煤灰的用法和樣例：
例句
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現代城市是由大得怕人的大廈和充斥著難聞的汽油味，煤灰和有毒氣體和又陰暗又狹窄的街道所組成。
The modern city consists of monstrous edifices and of dark narrow streets full of petrol fumes, coal dust, and toxic gases. -
污垢，灰垢黑色臟物或煤灰，尤指附著或深嵌在一個表面上的污垢
Black dirt or soot, especially such dirt clinging to or ingrained in a surface. -
你臉上有塊煤灰污跡。
You'vegot a smudge of soot on your cheek.
