Poetry: "The mountains cover the day, and the sea drains the golden river. But as long as you go up a flight of stairs, you can broaden your horizons by 300 miles. " It means that if you want to see endless beauty, you should go to by going up one flight of stairs. Metaphor means that if you want to achieve greater success, you must make more efforts; If you want to make a breakthrough on a certain issue, you can look at it from a higher angle; It also expresses that only by being positive can we be far-sighted.