"Take copper as a mirror, you can straighten your clothes, learn from others, know the gains and losses, learn from history, and know the rise and fall." We know history because it is a mirror. Understanding history means understanding our past, summing up experiences and lessons from history, and playing a guiding role in our lives.

From the well-known idiom stories: a straw boat borrows an arrow, pulling out a seedling to encourage it, and a foolish man moves mountains, we are told that we should master certain methods and skills in doing one thing, and we should not be eager for success in everything, but we must persevere rather than give up halfway in order to achieve our goals. The discipline of Newtonian Mechanics, Nine Chapters of Arithmetic and avogadro's Law, which we have learned, are not only the existence of history, but also the basic contents that we must master in our study. Yue Fei's patriotic feelings from loyalty to serving the country are worth learning and admiring by each of us. When Chen Shimei abandoned his wife, he was accused by the world and taught us the basic moral requirements for doing things for others.

Because of this, there are a lot of twists and turns in our life, and a lot of confusion at the fork in the road. But what if there is no history?

from a young age, we need to constantly explore all aspects of life. Maybe we are a farmer, and when we see others pulling this seedling, we will think it is a good practice and even try to follow suit. Of course, you will say that now we will all wait and see and wait for the result before making a choice, but when the result comes out, isn't it history and your reference?

On a larger scale, if our new-democratic revolution did not keep advancing on the experience of our predecessors, would it have such a fast and good result?

understand history, take its essence and discard its dross. This is our purpose of learning history and understanding history.