This sentence comes from Li Shimin, Emperor Taizong. It used to be understood that reading history books can help you understand the way of governing the country, the way of rise and fall, and the way of survival. Later, I gradually realized that there is a premise that history will repeat, and repetition is based on the fact that the basic social conditions have not changed. China has been in an agricultural society for more than two thousand years. In this context, historical events will repeat themselves, and reading history books will be of reference significance. In modern times 100 years, China has rapidly entered the industrial society from the agricultural society. In the post-industrial society, the old things have been changed and the conditions for the recurrence of historical events have disappeared. We are facing an unprecedented situation, and it is of little significance to learn from history. Therefore, we should fully understand this sentence and look at the problem with a changing eye. Otherwise, history will lead us into a misunderstanding. ...