Wood is a good tool and raw material, especially in ancient times, it was used to build houses, cars and ships. Many furniture in the house, such as chairs and beds, are also made of wood. If this kind of wooden chair is placed outdoors all the year round, even in your own yard, you can't sit on it in summer, because it will absorb water and be infected with moisture.
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In traditional Chinese medicine, moisture is still difficult to cure. This moisture trapped in the human body all the year round will cause many diseases, such as various skin problems and rheumatic joint diseases, which will cause great pain. So don't sit on wooden chairs in summer, pay attention to moisture. So you can't sit on a stone in winter?
As we all know, the temperature of stone is generally proportional to the ambient temperature. In summer, hot stones can burn eggs, and in winter, stones will get cold and sit on an ice butt. If you sit for a long time, it will damage the kidneys and other organs in the human body, leading to unstable metabolism and possible symptoms of various infections. In ancient times, it was difficult to have a cure.
Of course, even in modern times, don't die. After all, no one wants to spend money to go to the hospital to suffer from a serious illness, right? So listen to your family and remember the advice of your ancestors. The experience of people who have experienced it always makes sense.