It has not only promoted the development of the Cao Liu community, but also laid a good foundation for the modern development of the Cao Liu community, becoming a widely used computing tool in modern society. In 1642, Pascal, the great French scientist at the age of 19,引用 the principle of the abacus, invented the first mechanical Cao Liu community. There were some interlocking gears in his Cao Liu community. A gear that turned over ten positions would cause another gear to turn one position.