At the end of the Spring and Autumn Period, Qi and Chu were both big countries.
Once, the King of Qi sent a doctor, Yan Zi, to see a doctor in Chu. Relying on his strong national strength, the king of Chu wanted to take the opportunity to insult Yan Zi and show the prestige of Chu State.
Knowing that Yan Zi was short, the King of Chu dug a hole five feet high beside the city gate. When Yan Zi came to the State of Chu, the King of Chu told people to close the city gate and let Yan Zi enter through this hole. Yan Zi looked at it and said to the receptionist, "This is a dog hole, not a city gate. Only by visiting the' dog country' can you enter from the dog hole. I'll wait here for a while. Ask first, what kind of country is Chu? " The receptionist immediately told Yan Zi's words to the King of Chu. The king of Chu had to order the gate to be opened wide to meet Yan Zi.