What exactly do the four great wisdom handed down for thousands of years mean?

Four great inventions in ancient China

The Four Great Inventions is a viewpoint about the history of science and technology in China, which refers to the four great inventions in ancient China that had great influence on the world. They are important creations of working people of ancient Han nationality, generally referring to papermaking, compass, gunpowder and movable type printing. This statement was first put forward by Joseph Needham, a British sinologist, and was later inherited by many historians in China. It is generally believed that these four great inventions greatly promoted the development of politics, economy and culture in ancient China. These inventions spread to the west through various channels and had a great influence on the history of world civilization. The four great inventions left a brilliant page in the history of human science and culture and promoted the progress of human history.