求这句英文的各部分结构分析H2S pollution from artificial sources is not as much as of an overall air pollution problem as SO2 pollution.最重要的是帮忙分析一下那个“of”是什么成分?然后给几个of的作用类似的例

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求这句英文的各部分结构分析
H2S pollution from artificial sources is not as much as of an overall air pollution problem as SO2 pollution.最重要的是帮忙分析一下那个“of”是什么成分?然后给几个of的作用类似的例句看看……谢谢

H2S pollution from artificial sources是主语,s is not as much as是谓语,of an overall air pollution problem as SO2 pollution是宾语,带of的介词短语,of表示所属关系.
例如Journal of the Air Pollution Control Association.