Ballistite was a smokeless propellant that combined nitrocellulose and nitroglycerine.

弹道石是种无烟推进剂，结了纤维素和油。

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

他使用了纤维素， 种易燃固体，通过将棉花与酸成坚硬、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.

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