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一般情况下,我们的免疫系统总是恪尽职守、默默无闻;而只有当它们表现不佳的时候,我们才会慢慢地认识它。那么它是如何抵抗外来的侵略者的呢?哪些因素会削弱它的抵抗力?我们又是怎么能够帮助它完成艰难的抵抗任务呢?