The nervous system is an electrical network in the body. Discomfort is perceived when the body senses an assault and sends an electrical signal to the brain.

• 神经系统有如身体的电力网络，当身体受到如温度、压力等刺激时，神经系统便会发出电力讯号，并随即传送至脑部，产生不适感觉。