“春眠不觉晓,处处闻啼鸟.夜来风雨声,花落知多少?”春天,本是大地复苏、万物蓬勃的美好季节,作为万物之灵的人类却出现“不觉”晓的反常现象,这是何故？ 我们知道,人的生理活动是与外界有关联的。冬天,人们受到寒冷的刺激,皮肤毛细血管处于收缩封闭状态,血流量减少,皮肤就像一堵挡风的墙,抵御着寒冷,减 “Spring is the recovery of the earth, the wonderful season of all things, the human being as the spirit of all things but ” do not feel " Xiao abnormal phenomenon, why is this? We know that people’s physical activity is related to the outside world. In winter, people are stimulated by the cold, the skin capillaries in the closed state of contraction, reduced blood flow, the skin is like a wall of wind, against the cold, minus