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　　第?(di)一??(yi)道??(dao)防??(fang)御??(yu)是?(shi)物??(wu)理??(li)屏??(ping)障??(zhang)??，比??(bi)如??(ru)皮??(pi)膚??(fu)和??(he)黏??(nian)膜??(mo)??，像??(xiang)城??(cheng)墻??(qiang)一??(yi)樣??(yang)覆??(fu)蓋??(gai)體??(ti)表??(biao)??，通??(tong)過(guò)??(guo)汗??(han)液??(ye)、皮??(pi)脂??(zhi)和??(he)黏??(nian)液??(ye)中??(zhong)的?(de)抗??(kang)菌?(jun)成??(cheng)分??(fen)??，直??(zhi)接??(jie)阻?(zu)擋??(dang)細(xì)??(xi)菌??(jun)、病??(bing)毒??(du)入??(ru)侵??(qin)；比?(bi)如??(ru)呼?(hu)吸??(xi)道??(dao)纖??(xian)毛?(mao)??，如??(ru)同??(tong)護(hù)??(hu)城??(cheng)河??(he)的??(de)“清??(qing)道?(dao)夫??(fu)”??，通??(tong)過(guò)??(guo)擺??(bai)動(dòng)??(dong)??，將??(jiang)灰?(hui)塵??(chen)和??(he)病??(bing)原??(yuan)體??(ti)排??(pai)出??(chu)體??(ti)外??(wai)??。??　　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)服祝(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(guò)??(guo)敏??(min)、自??(zi)身??(shen)免??(mian)疫??(yi)病??(bing)等?(deng)問(wèn)??(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(guò)??(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)??。。