Ballistite was a smokeless propellant that combined nitrocellulose and nitroglycerine.

弹道石一种进剂，结合了硝化纤维和硝化甘油。

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浸入蜡中会使成为一种坚硬耐用的物质，并将申请了赛璐珞专利。

But could the men have picked up nitrocellulose on the train?

那么，些人否可能在火车上接触到了硝化纤维呢？

And when you expose cellulose, like in wood pulp or cotton, to nitric acid, it forms cellulose nitrate -- which is highly flammable.

当你将硝酸暴露在纤维上， 比如木浆或棉花中，它会形成硝化纤维——一种极易燃烧的物质。

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， 一种易燃固体，通过将棉花与硝酸混合制成坚硬、闪亮的白色球体。

It proved that you've been handling something called nitrocellulose, which, yes, that is found in explosives, but it's also found in a number of other things, including playing cards.

证明你接触过一种叫硝化纤维的东西，没错， 它在炸药中存在，但也存在于他多种物品中，比如扑克牌。

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，因为硝化纤维会在微风中爆炸。