Under normal circumstances people generally prefer to avoid stimulation, but when they enter a state of alert, well prepared, when the experience of fear is also a happy experience.

• 人在正常情况下人们一般愿意选择避免刺激，但是，当他们进入戒备状态，做好了充分的心理准备，体验恐惧时也在体验快乐。