Provided that the city's education resources can be fairly distributed among different schools, there will be no difference between key schools and ordinary schools, and some teachers will not be "rich" because of excessive accumulation of education resources. With fair distribution among them, mountain village schools in remote areas can get more investment, then rural education will not be so difficult. What does this text mainly talk about? ['Fairness of educational resources.', 'Polarization of teacher income.', 'Regional disparity in the allocation of educational resources.', 'Hierarchy of schools.']