실수로 바늘에 찔리거나 끓는 물에 흠뻑 젖어있을 때, 당신은 우리 몸에 많은 신경이 있기 때문에 강한 불편 함을 느낄 것입니다. The nerves contain a large number of neurons. When the neurons receive external stimulation and immediately convey it to the brain, we have a feeling. The sleeves are covered with ubiquitous clothes, but the sensitivity of the lip and fingertips is dense, so the neurons in the upper limbs are distributed relatively sparsely, so the nervous system does not command the work. If the normal function of the body will occur, it will malfunction, or even all fail, endangering our lives.
