如果一个人单独在原始森林中行走,他一定会小心翼翼,时刻防备着可能遇上的毒蛇猛兽。这种高度紧张的心理和生理状态,被称为应激,也就是对某种刺激做出紧急反应的意思。加拿大的汉斯博士做过这样的实验:他把老鼠捆绑在笼子里,在笼外放一只猫,并用光、热、冷、痛等方法刺激猫大声叫,从而使老鼠长时间处于极度紧张状态。结果发现这种持续的应激状态引起 If a man walks alone in the primeval forest, he must be careful and guard against any possible serpents. This highly stressed state of mind and body is called stress, meaning an emergency response to a stimulus. Dr. Hans of Canada did such an experiment: he tied the mouse in a cage, put a cat outside the cage and used the light, heat, cold, pain and other methods to stimulate the cat to loudly cry, so that the mouse for a long time in extreme tension status. The results showed that this continuous stress caused