夏天,人体为了保持体温的平衡,更好地向外散热,于是皮肤表面的血管扩张变粗,汗毛孔也敞开出汗.这时,突然刮起一阵冷风、下一场雨,或者因为贪图凉快在院里睡觉、洗冷水澡,就容易着凉,发生伤风感冒.由于这种病多在热天发生,所以又叫热伤风. In summer, in order to maintain the balance of body temperature and to dissipate heat better, the blood vessels on the surface of the skin become dilated and sweaty pores sweat away. Suddenly a cold wind, a rainy day, In the yard to sleep, take a cold shower, it is easy to catch cold, colds occur. Because this disease occurs in hot days, so called hot cold.