3.We were prevented by heavy smog from seeing anything.
浓使我们看不到任何东西。
4.urban problems such as traffic congestion and smog; the philosophical problem of evil.See Usage Note at dilemma
诸如交通拥挤和烟的城市疑问;关于罪恶的哲学见 dilemma
5.The function of hydrocarbons and nitrogen oxides in photochemical smog formation and the formative process of ozone and peroxyacetyl nitrate are discussed.
6.Afterwards " fuliginous model " , " photochemical smog " after pollution, modern is being entered with " indoor air is polluted " the 3rd generation that is a mark pollutes period.