Exposing books is a Chinese word, which means printing books. In the old society, there was a custom of drying books on Tanabata. Exposing books is a very effective physical method, which can reduce the humidity of documents by drying in a dry environment, so that pests and molds can not survive and no longer breed.
The history of publishing books can be traced back to Guo Pu's Biography of Mu. Qin Guan's Two Rhymes Kong Yanchang Reveals Other People's Books and Kong Wuzhong's Five Words and Four Rhymes of Ren Shen Zhong Qiu Dong Guan Reveals Books describe in detail the grand occasion of the book unveiling meeting in the Song Dynasty.
Uncovering books is a fashion.
In the Song Dynasty, book exposure became a fashion, not just book printing, but a social activity triggered by book exposure, referred to as book exposure meeting. For example, during the Song Dynasty, the Royal Library of the Song Dynasty would expose its books in July. During this period, these books were all open to literati, similar to the current group book fair.
This scene has also become a special activity in the Song Dynasty, where literati and poets can feast their eyes. As a social activity, book exposure is not only the best time to show one's self-cultivation, but also the best time to show one's book details. Therefore, in addition to this high-level book exposure meeting at the national level, there are also private individual book exposure meetings.
Refer to the above content: Baidu Encyclopedia-Revealing Books