Where does knowledge come from? Knowledge is not just talk. It takes a lot of accumulation, reading and time to acquire knowledge. The main way for our pupils to acquire knowledge is to read more extracurricular books. The extracurricular books I am talking about here are not comics, but books that are beneficial to our primary school students, such as literature, biography, prose and so on. It's no good reading, but also reading good books. Reading books is not enough. We also need to combine theory with practice. Practice is the ladder to realize the ideal. Lu You's poem says: It's hard to know what you've got on paper, but you have to do it. It tells us that knowledge can only be properly applied on the premise of combining theory with practice, and it is not feasible to mechanically copy the theory in books. Isn't it harmful for Zhao Kuo to talk on paper? Now, we should accumulate more knowledge in order to be useful in the future. With more knowledge, we have more chances of success. As we all know, Zhuge Liang is resourceful and omniscient. Geography and astronomy are omniscient, and human feelings are omniscient. That's why we have accumulated more with him.