The pool water in autumn is really cold. What stem?

What about confession? The next sentence is that my arms are warm.

Autumn is one of the four seasons. In China, traditionally, "beginning of autumn" in the 24 solar terms is taken as the starting point of autumn. Entering autumn means that rainfall and humidity tend to decrease or decrease. In nature, everything begins to grow from lush to mature. According to the average temperature of modern scholar Zhang Baoyun, there are four seasons in a year. The index is that the average temperature is lower than 10℃ in winter, higher than 22℃ in summer, and 10~22℃ in spring and autumn respectively.

In China, traditionally, "beginning of autumn" in the 24 solar terms is taken as the starting point of autumn. Entering autumn means that rainfall and humidity tend to decrease or decrease. In nature, the qi of Yin and Yang began to change, the yang gradually declined, the yin gradually flourished, the climate changed from hot to cold, and everything was born with the cold in the qi and gradually declined. According to modern meteorology, autumn in north temperate zone is from August 23rd (hot summer) to165438+1October 22nd (light snow). Autumn in the south temperate zone is from February 19 (rain in the northern hemisphere) to May 2 1 (xiaoman in the northern hemisphere).