In praise of the four great inventions of China: gunpowder.

A thousand years and a long life will be in vain, and a sword that can kill people and save the world has been forged. Compass: Sailing across the seas does not depend on the sky, and the whole world is included in the small compass.

On the day when the five continents wake up from their dreams, China has been flying for a hundred years. Cai Lun's papermaking skills turned decay into a miracle inherited from his ancestors, and the treasures of his study were passed down from generation to generation.

How rich is Qianqiu merchant? Cai Gong's patent money has not been paid. Bi Sheng Movable Type Printing A piece of clay is used to wed firewood, and it is so happy to give birth to a spiritual child.

Thanks to Buyi for spreading the word. Buyi has no intention of singing too many songs.