What do you mean, it's morning and evening, and the fallen leaves surprise the autumn?

"Sooner or later, the fallen leaves surprise autumn" means: just like the morning and evening (the sun and the moon alternate), people are surprised that autumn is coming when they see the fallen leaves.

The phrase "The end of the world, the fallen leaves return to their roots" comes from beginning of autumn written by Liu Yanshi in Tang Dynasty.

I quit filariasis this morning, and my business has been stunned. Clouds gather summer colors and autumn leaves move.

Introduction of solar terms

Beginning of autumn doesn't mean the extreme hot weather is over. Beginning of autumn is still in the summer heat period, and the summer heat will not come out until the second solar term in autumn. It's still very hot in early autumn. The so-called "heat is in the dog days" is also called "beginning of autumn drops later", and there is at least "falling" hot weather after beginning of autumn. According to the calculation method of "dog days", the days of "beginning of autumn" are often in the middle of dog days, that is to say, the heat is not over, and the real coolness usually comes after the Millennium solar terms. The watershed of summer heat is not in the solar terms in beginning of autumn.