What does it mean to be cool in spring and autumn?

It makes sense to say that spring covers autumn and freezing. Spring covers are from winter to spring. Don't be too eager to take off your thick clothes. Wear more clothes, cover them with warm clothes, and slowly fade away the winter clothes with the warming rhythm. In this way, people will be healthy, will not be attacked by cold air, will not catch a cold, will not get sick. Autumn freezing means from autumn to winter, don't add too many clothes at once, but wear them slowly. If you wear too much and too warm at once, it will be really cold, and it may not be enough to keep out the cold even if you wear too much. The word "spring covers autumn and freezing" is also passed down from generation to generation by our ancestors. It is very reasonable that they have raised generations of people in this way, not only for children, but also for adults. Look at that. The weather in spring doesn't warm up at once, but the temperature rises a little bit, which makes people feel comfortable and pleasant, so you can't be too impatient to take off your winter clothes. Taking it all at once may be bad for your health. There is a saying that it is still cold when it is warm at first. If you take off your winter clothes too early, the cold in winter will invade your body and do great harm to your body, especially to people with weak constitution. You should cover them and slowly shed the thick winter clothes.