The release of the third series of commemorative covers and personalized stamp booklets of "Important Scientific and Technological Inventions and Creations in Ancient China" was held on December 22 at the National Science and Technology Communication Center in Beijing. The day coincided with the winter solstice, one of the twenty-four traditional Chinese solar terms, and a total of nine themes, including the "twenty-four solar terms" and "Chinese bead counting," were selected for the third series of commemorative covers of "Important Scientific and Technological Inventions and Creations in Ancient China". A total of nine subjects, including the "Twenty-four Solar Terms" and "Chinese Abacus", were selected for the third series of "Important Scientific and Technological Inventions and Creations of Ancient China".

����The third series of commemorative covers of "Important Scientific and Technological Inventions and Creations in Ancient China" with the beauty of both science and art consists of nine pieces, namely, "Correction of Law Pipe Mouths", "Forbidden City", "24 Seasons", "The Book of Benji", "The Book of the Dead", "The Book of the Dead" and "The Book of the Dead". "Classification System of Materia Medica", "Brewing of Alcoholic Beverages", "Chinese Abacus", "Jade Cutting " "Double-acting piston airbox" "Rotary rudder". Among them, "Forbidden City" adopts special technology, and the main picture on the front of the commemorative cover uses transparent color UV technology.

����The series of commemorative covers and personalized stamps of "Important Scientific and Technological Inventions and Creations in Ancient China" are designed and produced based on the 88 items of "Important Scientific and Technological Inventions and Creations in Ancient China", which are the stage-by-stage research results of the Institute of the History of Natural Sciences of the Chinese Academy of Sciences, aiming at showing the scientific achievements and technological civilization of Ancient China, disseminating the scientific ideas, promoting the spirit of science and enhancing cultural self-confidence. The purpose is to show the scientific achievements and technological civilization in ancient China, disseminate scientific ideas, promote the spirit of science and enhance cultural confidence. This series of covers was designed by Zhang Panjian and Zhang Qingfeng, and comes with exquisite covers, which visually represent the scientific and technological achievements through the main picture, postmarks and personalized stamps.

����The third series of commemorative covers selects a number of representative ancient scientific and technological inventions and creations, showcasing the wisdom of ancient China in a variety of fields ranging from agronomy and textiles to materials and utensils, from mathematics and optics to engineering and construction, and from medicine and rhythms to vehicles and ships and instruments. Among them, the Palace Museum in Beijing, formerly known as the "Forbidden City", is a masterpiece of ancient Chinese palace architecture, which is not only an important material carrier of Chinese traditional culture, but also witnessed the development of the Chinese nation's pluralistic and integrated pattern; "24 Solar Terms", originated in the Warring States period, matured in the Warring States period, and was first used in the Chinese Civil War. Originated in the Warring States period and matured in the early Western Han Dynasty, it is an outstanding creation of the Chinese forefathers, occupies an important position in astronomy and calendars, and is a summary of the experience of the Chinese working people in mastering the agricultural affairs and seasons; "Chinese Bead Counting" takes the abacus as a tool, and utilizes the mnemonics to add, subtract, multiply, divide, and open the square with the beads plucked by the thumbs, forefingers and middle fingers (the upper bead and the lower bead), It has been inscribed on the Representative List of the Intangible Cultural Heritage of Humanity; the "brewing of alcoholic beverages" contributed to the development of agriculture and food processing technology, and the invention of the "wine quill" was thousands of years earlier than in Europe, and the Chinese wine with its distinctive flavor brewed with it is now deeply rooted in the daily life and social life of the people.

����The release event was jointly organized by the Academic Department Work Bureau of the Chinese Academy of Sciences, the Science and Technology Communication Center of the Chinese Association for Science and Technology, the Institute of the History of Natural Sciences of the Chinese Academy of Sciences, China Philatelic Co. Ltd. and the Chinese Society of Science and Technology Journalism. Prof. Feng Lisheng, director of the Institute of History of Science and Technology and Ancient Documents of Tsinghua University, and Associate Researcher Li Jinsong of the Institute of the History of Natural Sciences of the Chinese Academy of Sciences, also made a presentation on the " Chinese bead counting", "the brewing of alcoholic beverages", two important ancient scientific and technological inventions for science and technology report.

����According to the introduction of the organizers, "China's ancient important scientific and technological inventions" series of commemorative cover planning to be issued in ten series, issued a series of quarterly, the first series and the second series have been issued in May 2023 Science and Technology Workers' Day, September National Science Popularization Day, the fourth series is scheduled to be issued on March 20, 2024 equinox day, the theme of the contents include "six bodies of charting "" Potala Palace """ yin and yang calendar """ prescription """ tea tree cultivation "" porcelain """ system of linear equations and solutions "" compass (compass) """ Zheng He sailing ". (Reporter Sun Zifa)

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