In the Qing Dynasty, there was a writer named Gao Shiqi in the Kangxi Expedition to Pingding Gardan, who discovered a "treasure" food in the process of joining the army and gave him a poem "Guozidan".
The undercover agent was very happy today, and he received a letter from the general.
He joined the army since he was a child, determined to serve the country, but since he arrived in a foreign country, he has no information about the army, and he survives in all kinds of doubts every day, occasionally letting merchants bring out one or two secret reports for the reference of the army. He was frequently engaged in boring and dangerous work, and at first the little fighting spirit was worn away.
No, the general's secret message arrived, and he aroused a new fighting spirit: ten days later, he sent troops to listen to the defensive plan.
In just twelve words, one word is revealed: difficult!
"Alas, after eating MeSince to work!" The undercover agent thought so and did the same, a thin layer of cyanotic red letter paper entrance, sour and sweet, not to mention quite delicious. (The story is purely fabricated)
"Guozidan" can be used to write military books, which can be eaten with Bi ke, which will not leak secrets and quench thirst. At that time, for those marching on the desert without water, this was more practical than "looking for plums to quench their thirst". As for the ink on the "Fruit Dan", it is not only harmless, but also useful, because the ink itself is a medicine. According to the "Compendium of Materia Medica", ink can "hemorrhoids and blood on the skin, alloy sores", gold sores refer to common knife and gun wounds, it can be seen that the godan skin is also quite suitable for military use.