洪炉燎发

Explanation: The furnace: a large stove. A furnace and burned hair. Metaphor to easily solve. 　　Source: "Historical Legends of Assassins" husband to a feather burn charcoal in the stove top, will carry on without incident. " 　　Examples: General Huang Wei this battle, soldiers have to palm, Long Xiang tiger step, compete with heart; if Yuzhu eunuchs, like a drum ~ ear. (Ming Luo, "Three Kingdoms" the second time)