礦井瓦斯,有毒氣體礦井中有時污染空氣的惡臭氣體或有毒氣體
Foul or poisonous gas that sometimes pollutes the air in coal mines.
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.