1, the long river of history is a metaphor for history, that is, history is like a long river. It can be understood that the characteristics of a long river are the characteristics of history. Refers to a long history, a long history and a long history.

2. History, referred to as "history" for short, refers to the systematic recording, research and explanation of the past events and activities of the Human Society. History exists objectively. No matter how writers write history, history exists in its own way and cannot be changed.