It's very hot today. During the day

Popular science: A cold is a disease caused by upper respiratory tract infection by cold virus, which has nothing to do with weather or cold and heat. The cold in autumn and winter is related to dry air (including indoor air and outdoor air). Indoor doors and windows are closed in winter, which is also the cause of frequent colds. If the air is dry, the cold virus will float in the air and be easily inhaled into the nasal cavity to cause a cold. A cold has nothing to do with bacteria, immunity, resistance, rain, taking a cold bath and so on.

To prevent colds, in addition to often opening windows for ventilation and maintaining a certain humidity in the room, try not to pick your nose and rub your eyes with your hands and wash your hands frequently.