2. In spring, the temperature in nature is rising, but due to the thermal inertia of the house, the indoor temperature can't keep up with the outdoor, resulting in the temperature difference between indoor and outdoor. This temperature difference reaches its maximum in the sunny afternoon of a day, often as high as 3-5℃ or even more.

3, especially from the warm sunshine into the cool room, the elderly and patients must add clothes in spring to avoid catching cold and getting sick. Because the temperature rises (falls) fastest in spring (autumn) in China at the same latitude, the unique health-keeping proverb "Cover the spring and freeze the autumn" in China was born.

Winter goes to spring, which is a transitional stage from cold to hot. Although the weather is getting warmer, the climate often changes, sometimes warm and sometimes cold. Often the sun will be warm, sunny and cold when it rains.

Because people are used to wearing more clothes in winter, if they take off too much in spring, they will not adapt to climate change and get sick easily. Therefore, in the early spring, you should deliberately cover a little and slowly reduce your clothes.

6. The temperature drops in autumn. Due to the thermal inertia of the house, the indoor temperature lags behind the outdoor nature, resulting in an opposite temperature difference. Walking into the room from the outside, the temperature rises, so it is natural to take off your clothes and freeze in autumn to prevent sweating from hurting your body.

7. Going to Qiu Lai in summer is a transitional stage from hot to cold. Although the weather is getting cold, there is a process of change.

8. Some people put on a lot of clothes soon in autumn, and even put on cotton-padded clothes too early. This is not good, because putting on cotton-padded clothes too early will make the body unable to exercise cold air, reduce the cold-proof ability, and is not conducive to the adjustment of human functions;

9. In this way, in the cold season of March 9, once the nose and trachea are attacked by cold air, the blood vessels inside can't resist and contract, which reduces the blood flow and weakens the antibacterial ability. Bacteria hidden in the nose or trachea take the opportunity to move, causing cough, sneezing, runny nose, fever and cold. Therefore, it should be frozen again in autumn, and clothes should be added slowly.