This is about the climate change in spring. Although spring is getting warmer, it is still cold in the morning and evening, and cold air activities are more frequent, and there will be late spring cold from time to time. If you take off your cotton-padded clothes too early, once the cold air strikes, you may not be able to adapt at once, and your body's resistance will drop, making you easy to catch a cold or even have a fever. Especially the frail old people and children with weak resistance. In the theory of traditional Chinese medicine, "spring covers the autumn freeze", and spring should cover it even more.