? A pestle and mortar is a tool for pounding grain or medicine. "The friendship between Chu and Jiu" comes from "Book of the Later Han Dynasty". "The Biography of Wu You". Original text: At that time, Gong Shamu came to visit Taixue. He had no financial resources, so he became a servant and rented a pound for you.

? You Yuyu was shocked, so he decided to hand it over between the pestle and mortar. Friendship between pestle and mortar means making friends regardless of poverty or humbleness. The ancient people used Chujiu as their name, which probably means the acquaintance of Chujiu, making friends widely, not being too poor and loving the rich.

During the Eastern Han Dynasty, there was a poor and studious scholar named Gongshamu. After studying hard for a period of time, I always felt that what I had learned was limited and wanted to enter the Imperial College in the capital to continue my studies.

Gong Shamu's family was poor and did not have enough money to pay for his studies at Imperial College. So Gongshamu went to work as a rice grinder in a wealthy family of Wu You. Wu You once held official positions such as Prime Minister of Qi and Chief History.

One day, Gong Shamu was pounding rice, and Wu You came to him. Wu You saw that Gong Shamu behaved politely and did not look like a rough worker at all, so he started chatting with him. During the conversation, Wu You found that Gong Shamu was knowledgeable and insightful. Regardless of the wealth gap between them, Wu You became friends with him in front of the pestle and mortar.

In feudal society, there were differences between rich and poor counties, and the hierarchy was strict. It is a rare thing for a rich man to condescend to make friends with a poor scholar, so it has become a legend.

"The friendship between pestle and mortar" comes from "Book of the Later Han Dynasty." "The Biography of Wu You". Original text: "At that time, Gong Shamu came to visit the Imperial Academy and had no financial resources, so he turned into a servant and rented a pound for You. You Yu was shocked, so he arranged to meet him between Chujiu and Jiu." "The friendship between Chujiu and Jiujiu" means There is no need to be poor or humble to make friends.