The smoke and pollutants in the atmosphere is the main reason for the formation of the paint fading, discoloration.
大气中的油烟和污染物是形成车漆褪色、变色的主要原因。
The reasons of the formation of Photochemical Smoke is analyzed, its production harms brought about, meanwhile, came up with some countermeasures of preventing photochemical smoke is discussed.
文章分析了光化学烟雾形成的原因，讨论了其形式的机理以及造成的危害，同时提出了防治光化学烟雾的一些对策。
Not only the formation, characters and harmfulness were introduced, but also the removal of free radicals in cigarette smoke by plant additives was discussed in detail.
本文介绍了烟气中有毒成分自由基的形成、性质及对人体的危害，并介绍了对植物添加剂降低清除烟气自由基的研究进展。
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