革新革新硝石工坊saltpeter_workshop_advancein_game/common/advances/1_building_unlocks.txt:244随着我军对火药需求的增长，稳定生产人造硝石已成为必要。需要切割轧机革新requires革新树全球贸易山顶吹风冶炼工艺切割轧机硝石工坊定义in_game/common/advances/1_building_unlocks.txt:244245age = age_4_reformation247unlock_building = saltpeter_workshop249requires = slitting_mills
切割轧机革新requires切割轧机革新requires切割轧机革新requires
