The so-called fear is a strong and depressed emotional state that individuals or groups deeply feel in real or imagined dangers. Its performance is: nervous, full of fear, unable to concentrate, blank mind, unable to correctly judge or control their own behavior, impulsive.

The emergence of fear is related to past psychological feelings and personal experiences. As the saying goes, "once bitten, twice shy." Some comrades-in-arms have been stimulated in the past, and a stimulating point has formed in their minds. When they encounter the same situation again, past experiences will be aroused, which will lead to fear. Fear is also related to people's personality. Most people are shy and timid from childhood and unsociable when they grow up. Lonely and introverted people are prone to fear.

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