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　　免??(mian)疫??(yi)系??(xi)統(tǒng)??(tong)的??(de)核??(he)心??(xin)使??(shi)命??(ming)不?(bu)是?(shi)“消??(xiao)滅??(mie)一??(yi)切??(qie)”??，而??(er)是??(shi)識(shí)??(shi)別??(bie)敵??(di)我??(wo)、清?(qing)除??(chu)威??(wei)脅?(xie)??。??　　許??(xu)多??(duo)人??(ren)誤??(wu)以??(yi)為??(wei)“免??(mian)疫??(yi)力??(li)越??(yue)強(qiáng)??(qiang)越??(yue)好??(hao)”??，盲?(mang)目??(mu)服??(fu)用??(yong)補(bǔ)??(bu)品??(pin)、濫??(lan)用??(yong)保??(bao)健??(jian)品??(pin)??，結(jié)??(jie)果??(guo)反??(fan)而??(er)引??(yin)發(fā)??(fa)過??(guo)敏??(min)、自??(zi)身??(shen)免??(mian)疫??(yi)病??(bing)等??(deng)問??(wen)題??(ti)??。??事??(shi)實(shí)?(shi)上??(shang)??，免??(mian)疫??(yi)系??(xi)統(tǒng)?(tong)的??(de)精??(jing)髓??(sui)在??(zai)于??(yu)“動(dòng)??(dong)態(tài)??(tai)平??(ping)衡??(heng)”——既??(ji)能??(neng)高??(gao)效??(xiao)防??(fang)御??(yu)??，又??(you)不??(bu)失??(shi)控??(kong)攻??(gong)擊??(ji)自??(zi)身??(shen)??。這??(zhe)種??(zhong)平??(ping)衡??(heng)一??(yi)旦?(dan)被??(bei)打??(da)破??(po)??，就??(jiu)像??(xiang)過??(guo)度?(du)緊??(jin)繃?(beng)的??(de)琴??(qin)弦??(xian)??，稍??(shao)有??(you)不??(bu)慎??(shen)便??(bian)會(huì)??(hui)走??(zou)音??(yin)或??(huo)斷??(duan)弦??(xian)??。。