What does it mean that there is no official document left in the case?

The meaning of the document without leaving a document in the case: document: official document.

There is no backlog of official documents on the desk, a Chinese idiom whose pinyin is àn wú liú dú. Describes handling official duties efficiently and promptly. It comes from "Shangqiu Song Family Tradition" by Zhu Yizun of the Qing Dynasty. Used as subject and predicate; as object.

Source: Qing Dynasty; Preface to Zhu Yizun's "Shangqiu Song Family Classic": "In the 17th year, the country was extravagant and frugal, and the troubles were simplified. ""

Example: When it comes to official matters, Zhang Ling listens to his decision. It is true that there are no documents left in the case, no unjust punishment in prison, and the people are very happy. "The Romance of Hong Xiuquan" by Huang Xiaopei of the Qing Dynasty

"牍" is a standard second-level character in modern Chinese. It is pronounced as dú in Mandarin. It was first seen in the Xiaozhuan era of the Qin Dynasty and is a pictophonetic character in the Six Books. The basic meaning of "牍" is the wooden pieces used for writing in ancient times, such as writing slips and ruler slips; its extended meaning is the name of ancient musical instruments.

In daily use, "牍" is also often used as a noun, indicating books, such as 牍书 and 牍书.

"牍" first appeared in the Xiaozhuan era of the Qin Dynasty. The shape of the seal script is like a wood piece, which means that the tablet is a piece of wood used for writing. It is sold for sale and to show off righteousness.

It means that slippers were sold in the ancient market. At that time, there were not many people who could read, and it was a great honor to be able to write on slippers. The slipper was simplified into slippers, the original meaning of which was wooden slips, regular script and simplified version of " "牍" all evolved from seal script.