What's the joke about "Shi Ding crossing the well"? Why is there such a joke? Why did Xia Zi dare to question the records in the book?

"Shi Ding goes through a well" makes a joke about Shi Ding going through a well. There will be such a joke, heard without trial, promoted in the summer, and defended. A reporter with a history of reading said: "Jinshi waded into the river three times." Xia Zi said, "No, it's self-pity. Husband' self' is similar to' three' and' sea' is similar to' sea'. " As for Jin, someone asked in time, and he said, "Teacher Jin has been involved in the river."

Later, people often use "three jackals crossing the river" or "three jackals crossing the river" to describe the typos and ridiculous mistakes in the article.