The industrial age. In the industrial age, the publicity of education has become increasingly prominent. With the increase of the knowledge content of industrial mass production, with the continuous fierce struggle of the working class and other working people for the right to education, and with the change of the management mode of industrial society, the hierarchical nature of agricultural social education and the class nature of industrial social education are becoming more and more out of date and criticized by the ruling class and the ruled class. In this case, the publicity of education is becoming increasingly prominent.