Objective: to investigate the content of trace element in hair and the condition of immune function in patients with recurrent respiratory infection (RRI).
目的：探讨反复性呼吸道感染患儿头发中微量元素含量及机体免疫功能状态。
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。
Through the process the initial system gain some immune function, it provide a basic condition for the evolution of the immune system.
该过程使初始产生的系统具有一定免疫功能，为免疫系统的进化提供了一个基础条件。
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