From what aspects do you write about the hot weather in the Outline of Intellectual Education? What's the use of writing like this?

There are more than 20 articles about "hot weather", some of which are written directly through the introduction of the author, and some are written indirectly through the language and actions of the characters.

Describe the function of "hot weather": ① Render the atmosphere and enhance the real feeling. "On a red day, there is not a cloud." How can porters travel in such weather without complaining? (2) Contrast psychology, form and spirit. "When all the soldiers looked at that day …", the weather was so hot that Jun Jian's resentment, anger and disappointment all appeared. ③ Change the scene and develop the plot. "The sun is like fire", and all the soldiers are thirsty. The folk songs sung by Bai Sheng just entered the ears of all the soldiers, and another scene began to promote the plot.

It shows the wisdom of a group of people such as Wu Yong, who is naturally very tired in hot weather. Huangnigang is also a must-see. Just enjoying the cool, hot people will be thirsty, and drinking water becomes a necessity. Naturally, there was a plan to drug the wine later.