"Mountains and rivers fall in autumn" has two meanings. On the surface, it means that the mountains and rivers in autumn have begun to be depressed and cold, the leaves are falling in the mountains and the river is calm. Another meaning is that time is fleeting, and the mood reflected by the cool autumn makes people feel the life near the old age. Most thoughts in autumn are saddled with sadness. It is a feeling that mountains and rivers fall in autumn and suddenly realize. Time is too short for us to really relax our vigilance.
"It's getting late, mountains and rivers are already autumn" tells us from another angle that we should always cherish time. An inch of time is worth an inch of gold, but a thousand dollars can't buy an inch of time. Let's seize the opportunity earlier and achieve a better life in the limited years of life. Even if you get up late, you should cherish every day!