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People always like to fire fireworks expressing their joy every major festivals or major events (such as Chinese New Year).Fireworks are beautiful,but also very dangerous.Every year always some people are injured by not completed exhausting fireworks.I am safe paint a small amount of temperature sensing fluorescent substance in the top of each small body of fireworks,when display,the gunpowder combustion temperatures and stimulate the fluorescent material to issued green fluorescence.Reminding people the fireworks has been released.Avoid not completed exhausting fireworks do any injury to the person.
Xuan Teng Huijun Chen