Teaching and learning are synonyms. They are originally the substitution state of quality, and one is the substitution and repetition of another. They are the same state, the only difference is the position of semantic state. Instruct teachers, schools, test, correct or criticize. Scholars imitate, test or revise these principles. The teacher is also studying; Scholars are also teaching. Teaching is learning, and learning is teaching. Imitation, test, correction or criticism means that you can use criticism, correction or imitation to replace the previous state of knowledge, so as to shine on you and produce new results. Teaching or learning can eventually teach students to "fly" and complete their studies, that is, graduation. Learning is homework (your responsibility and work). Industry is the truth of things. The yogi was called Big Ben in ancient times. The so-called big version is also a perfect interval. Erya Shi Qi is called "Big Edition Industry". Interval is what constitutes things. The truth of the matter is for the sake of it. Reason is knowledge put into the heart. The knowledge put in your heart is for everyone to reconstruct. The knowledge of the past or predecessors is our historical experience, and it is an experience to be passed down. However, those are relative to the past time and space, and they are not in a state of fitness, goodness and harmony with our time and space. Therefore, learning is to re-practice the discipline and achieve your own knowledge. This is the truth of reading, teaching and knowledge, and it is also a natural truth. There is nothing to say. This is what we study and study. Teaching or learning is to imitate the ancients or predecessors, make things clear from them, and acquire the knowledge you need. Teaching or learning means criticism and guidance. Teaching or learning, naturally, is to create a new situation, change dynasties, and establish another set of things that conform to the current state of time and space, so as to cultivate their ability to face the times and respond to the requirements of the times. This is the truth of education and reading, and it is meaningless. If you don't do this, you'll have to wait for death when it's stormy. At this time, if there is no way to study, a large part of these people who should bear social responsibility will be unable to become the mainstay of society because of their lack of ability and technology, thus causing national tragedy of the times.