Ballistite was a smokeless propellant that combined nitrocellulose and nitroglycerine.

弹道石无烟推进剂，结合了硝化纤维素和硝化甘油。

He used nitrocellulose, a flammable solid, created by mixing cotton with nitric acid to create a hard, shiny, white sphere.

他使用了硝化纤维素， 易燃固体，通过将棉花与硝酸混合制成坚硬、闪亮的白色球体。

By the middle of the century, American entrepreneurs discovered that dipping nitrocellulose in wax turned it into a hard, enduring substance, and patented it as celluloid.

纪中叶，美国企业家发现将硝化纤维素浸入蜡中会使其成为坚硬耐用的物质，并将其申请了赛璐珞专利。