This sentence came from the Tang Dynasty poet Wang Zhihuan's "Liangzhou Ci". The entire sentence was "Drunken on the battlefield, don't laugh at the ancient war, how many people have returned". The meaning of this sentence was that even if you were drunk on the battlefield, don't laugh at him because many people in history had experienced similar battles. This sentence expressed a kind of perseverance and open-minded spirit in the face of hardships and setbacks. It can also be understood as that even if we are in a difficult situation now, we should not be discouraged because many people in history have experienced similar tests, and we should learn from them and move forward bravely.