Mr. Mirror finally cast a glance at Li Chen.Mr. Mirror gazed at him carefully and exclaimed, "Young man, you have a noble spirit!"Li Chen cupped his hands and smiled, "Mr. Mirror, I am honored to meet...rom large red-clad cannons to small fireworks for the common folk, it's no longer anything new.But all of these gunpowder, without exception, are the least efficient black powder.Poor stability, low e...