for, he only thought about its manufacturing difficulty.After understanding, Song Yingxing said: "Your servant dares not disobey your command, but the development of gunpowder requires a large number...nd himself.I hope this attempt will end in failure, otherwise...Zhang Biwu must be eliminated.This probe...Thinking of this, Zhao Xuanji narrowed his eyes slightly and looked at Jue Ai.Just as if Zha...