Why was it that the knowledge in books could not be used in reality?

There were many reasons why the knowledge in books could not be used in reality. 1. Book knowledge is usually based on past scientific and technological standards, but the real world is changing very quickly. A lot of knowledge is outdated or no longer applicable to the current situation. 2. Book knowledge is usually based on existing knowledge framework and theories, while problems in the real world are often complex and diverse, requiring more specific solutions. Book knowledge is usually used to educate people so that they can master certain skills and knowledge. In real life, people need to apply this knowledge flexibly according to specific situations rather than simply applying templates or theories. Book knowledge is usually one-way, that is, from the author to the reader. However, the information and knowledge in the real world are diverse. People need to constantly receive and feedback in order to better understand and apply knowledge. To sum up, a lot of knowledge in books is not enough in real life, but this does not mean that the knowledge in books is unrelated to the problems in the real world. People need to constantly learn and explore in order to better cope with the challenges in the real world.