Ballistite was a smokeless propellant that combined nitrocellulose and nitroglycerine.

弹道石是一种无烟推进剂，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， 一种易燃固体，通过将棉花硝酸混合制成坚硬、闪亮白色球体。

It worked well once it was created, but the manufacturing process was dangerous because nitrated cellulose can explode in a warm breeze.

它一经创建就运作良好， 但制造过程很危险，因为硝化纤维素会在微风中爆炸。

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.

到本世纪中叶，美国企业家发现将硝化纤维素浸入蜡中会使其成为一种坚硬耐用物质，并将其申请了赛璐珞专利。