Before the invention of books, people wrote on stone and clay... But to make a book, a real book as we know today, you need paper and printing. 在书籍发明之前，人们在石头和粘土上书写... 但要制作一本书，一本我们今天所知道的真正的书，你需要纸和印刷术。

Paper was perhaps the greatest tool for (36) until the computer was invented. The best evidence indicates that paper was invented by the Chinese between the years 250 B.C. and 105 B.C. (37) studying Asian culture have found more (38) proof that paper was soon used to print money.

Paper money is one of the most (39) inventions in history, and it greatly helped the (40) of trade and commerce in China. People make a big mistake when they think that printing is (41) a Western discovery.

In fact, the first ideas about printing also came to us from China... It is said that in 11th century China, a blacksmith named Pi Sheng invented the best system for (42) with blocks.

Did this discovery travel to the West? Did a (43) make the discovery again by himself? Nobody is sure of the answer. But we do know that Johannes Gutenberg... created the first printing press with (44) type in Europe around the year 1450.

Without these contributions to paper and printing, it would not have been possible to invent the book, one of the highest (45) of the last millennium.