大雪过后,晨晨和伙伴们在小区院子里玩儿雪。堆个雪人,打了两场雪仗,玩儿了大半天,晨晨这才心满意足地回家。回到家里没一会儿,晨晨发现自己的手、脚还有耳朵变得又红又热还发痒。这是怎么回事呢?晨晨的这种情况属于冻伤。冻伤是当皮肤接触到非常冷的空气或物品,引起血管痉 After heavy snowfall, morning and morning play with friends in the yard. Heaping a snowman, playing two snow fights, playing most of the day, this early morning to go home with contentment. After returning home for a few moments, I found my hands, my feet and my ears getting red, hot and itchy in the morning. What’s going on? The morning is frostbite. Frostbite is when the skin comes into contact with very cold air or objects, causing vasospasm