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URL：https://cdn1.vox-cdn.com/thumbor/UACBnaHLsfL0jqRu6AIg_XoBJ5M=/0x53:1024x629/1600x900/cdn0.vox-cdn.com/assets/2873525/fireworks.jpg 掲載元：http://www.theverge.com/2013/7/4/4489980/how-do-fireworks-work
