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　　先??(xian)天??(tian)性?(xing)免??(mian)疫??(yi)是??(shi)人??(ren)類??(lei)與?(yu)生??(sheng)俱?(ju)來??(lai)的??(de)防?(fang)御?(yu)系??(xi)統(tǒng)??(tong)??，如??(ru)同??(tong)城??(cheng)堡??(bao)的祝(de)第??(di)一??(yi)道??(dao)城??(cheng)墻??(qiang)和??(he)巡??(xun)邏??(luo)衛(wèi)??(wei)兵??(bing)??，能??(neng)在??(zai)病??(bing)原??(yuan)體?(ti)入??(ru)侵??(qin)時(shí)?(shi)迅?(xun)速??(su)反?(fan)應(yīng)??(ying)?。??　　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)??。。