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。

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.

到本世纪叶，美国企业家发现将硝化纤维素浸会使其为一种用的物质，并将其申请了赛璐珞专利。

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

那么，这些人是否可能在火车上接触到了硝化纤维呢？

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

他使用了硝化纤维素， 一种易燃固体，通过将棉花与硝酸混合制、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.

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