Chinese medicine also teaches people to cover spring and freeze autumn. From the meteorological point of view, this paper further expounds the environmental reasons why it is a transitional season and the temperature is changeable, but it is frozen in spring and autumn.
It turns out that this is because the temperature changes in spring and autumn in opposite directions (warming up in spring and cooling down in autumn). In China, Leng Xia is hot in winter, and the temperature fluctuates greatly in spring and autumn. Because of the thermal inertia of the house, the indoor temperature changes far behind the outdoor. Therefore, the temperature difference between indoor and outdoor has reached a considerable level. In this way, if you go out and come back in the middle of spring, go indoors from the outside (especially in the warm sunshine). If you don't put on clothes in spring, over time, especially the old, the weak and the sick will catch cold and get sick. Autumn, on the other hand, is warm indoors, so you should wear less clothes after entering the house, which is freezing.
In fact, the indoor and outdoor temperature difference of China ancient deep house compound can be kept quite large in summer. Walking from high temperature into a cool room is also easy to get sick. In ancient times, it was called yin and summer heat. From the initial symptoms of fear of cold, body anxiety and limb pain, it is still very uncomfortable. However, this disease generally does not occur in other countries in the world, because of the large temperature difference between indoor and outdoor, which is only found in China naturally. It can be said that the traditional Chinese medicine and health culture formed by China's special climate have greatly enriched the connotation of Chinese medicine, and China's theory and practice of Chinese medicine have also made great contributions to world medicine.