Ballistite was a smokeless propellant that combined nitrocellulose and nitroglycerine.

弹道石一种无烟推进剂，结合了硝纤维素和硝甘油。

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

那么，这否可能在火车上接触到了硝纤维呢？

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

他使用了硝纤维素， 一种易燃固体，通过将棉花与硝酸混合制成坚硬、闪色球体。

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，美国企业家发现将硝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。

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.

这证明你接触过一种叫硝纤维东西，没错， 它在炸药中存在，但也存在于其他多种物品中，比如扑克牌。