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图4 雨后天晴的示意图
$\begin{array}{l}3{{\rm{O}}_{\rm{2}}}\mathop = \limits^{{\rm{放电}}} 2{{\rm{O}}_{\rm{3}}}\\{{\rm{O}}_3} = {{\rm{O}}_2} + {\rm{O}}\end{array}$