The full text has five parts altogether.Part one Always take a photograph of the full text,put forward the question,the basic intension of the theory that and analyze the open thought of changing and evolve briefly,trace back to the passing on of two kinds of thoughts or development course in order to make the body of stationery and compare the two to do foreshadowing differently.Second,three parts are traced back to and turned openly into thought the passing on of the theory or development course with evolving separately.Part four The ones that made a concrete analysis of and compared the two are different.Part five On the basis of comparing,reiterate Liu know several conceptions of history,draw the conclusion in two