3. The most printed dictionary: Xinhua Dictionary is a commonly used reference book for searching words. It is the largest printed book in China, 1982, 1 100 million copies, setting a world record for the largest printed reference book.
4. The earliest record of solar eclipse: There was a record of solar eclipse in China a long time ago. Xiaoya in the Book of Songs said that "it is normal if there is an eclipse every other month", referring to an eclipse in 776 BC, which is the earliest solar eclipse record in the world, 55 years earlier than foreign countries.
5. The earliest historical map: More than 2,000 years ago, China produced high-level works such as Yu Gong and Shan Hai Jing. 1700 years ago, Pei Xiu of the Western Jin Dynasty drew the Yugong Regional Map, which is the earliest historical map in the world.
6. The earliest monograph on acupuncture: The Classic of Acupuncture compiled by Huangfu Mi, a famous acupuncturist in Jin Dynasty, is the most famous monograph in the history of acupuncture in China, which plays an important role in the history of acupuncture in China and is a must-read book for future generations to learn acupuncture.