What does "Gudan" mean?

Gudan is the name of a natural village. "Geography in the Book of the Tang Dynasty" said: In the third year of Wude (AD 620), Heyang was analyzed and Gudan County was established, and four years was the province. "Later generations called it" Gu Erdan "and became a village. So far, it has been renamed as "Guo Dan", otherwise people from other places will ask about its village and no one will know.

In the Five Dynasties, Guo Weiyuan was our envoy in the later Han Dynasty. It is said that Yin Di and Liu Chengyou, who were suspected to be Han people, started here. Every day at sunrise, he gets up to train. In the fourth year of Ganyou (95 1), he fought against the Han Dynasty and soon entered the capital of Korea. Yin Di was killed by mutinous soldiers. Guo Wei proclaimed himself emperor with Juice Beijing. Being born in poverty, he is very sympathetic to the people's sufferings. After he acceded to the throne, he attached great importance to the economy, was modest and eager to learn, hated corrupt officials, abolished exorbitant taxes and levies, actively rewarded production, and was lifeless for a while. People are grateful that he is a good monarch. Therefore, the "Gu Erdan" he trained in this camp every morning was renamed as "Guo Dan".

Please meet Dong Xiling during the reign of Emperor Qianlong, who was once an anonymous fortune teller. A private interview with a headless body. Passing by the village, I asked about the name of the village and sighed and said,' Gu Erdan was named after the county was established in the Tang Dynasty.' Gu Erdan is poor! The original of the south. Today is an auspicious day, so it is very peaceful! Don't you need it? "From then on, it was renamed" Gu Erdan ". Although it is still used today, it is still called "Guodan".

Gudan, 7 kilometers north of Chengguan Town, is the seat of Gudan Town Government. There are new and old He Sui Rivers in the territory, Luo Chang Highway runs through the north and south, and Guhu Highway is at the intersection of main street in the west. There are ancient temple fairs on April 12 and July 12 of the lunar calendar. After the founding of People's Republic of China (PRC), a new material exchange meeting was held every year on the seventh day of the seventh lunar month. Because of the convenient transportation, people often come here, and the market trade is quite active. 58660 . 6868686866 1

Gu Erdan: It's a sunny day. In the past, it was often used as a synonym for auspicious days. [Ci Hai (1999 edition, phonology, Shanghai Dictionary Publishing House, 1 edition, 2002), p.564]

The "valley" here cannot be simplified as "valley". Moreover, the word "grain" must not be thrown away, otherwise it will be another word "yi" (wood name, that is, structure or bamboo bark can be used to make paper), although both of them read gu3.