The human body is a machine that has a bunch of functions, and it accumulates various types of damage as a side effect of the normal function of the machine.
人体是一个行使着多种功能的机器，它积累着各种各样妨碍机器正常功能的伤害。
Only the immune system develops the homologous function and keeps the opposite balance under the condition of normal, the machine body then can maintain the existence.
只有免疫系统在正常条件下发挥相应的作用和保持相对的平衡，机体才能维持生存。
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