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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??(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??(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??(hu)城??(cheng)河??(he)的??(de)“清?(qing)道??(dao)夫??(fu)”??，通?(tong)過??(guo)擺??(bai)動??(dong)??，將??(jiang)灰??(hui)塵??(chen)和??(he)病??(bing)原??(yuan)體??(ti)排??(pai)出??(chu)體??(ti)外??(wai)??。??　　B細?(xi)胞?(bao)作??(zuo)為??(wei)“抗??(kang)體??(ti)工??(gong)廠??(chang)”??，能??(neng)針??(zhen)對??(dui)不??(bu)同??(tong)病??(bing)原??(yuan)體??(ti)定??(ding)制??(zhi)特??(te)異??(yi)性??(xing)抗??(kang)體?(ti)??，通??(tong)過??(guo)中??(zhong)和??(he)病??(bing)毒??(du)或??(huo)標??(biao)記??(ji)病??(bing)原?(yuan)體??(ti)協(xié)??(xie)助??(zhu)清?(qing)除??(chu)機?(ji)制??(zhi)；同??(tong)時??(shi)分??(fen)化??(hua)出??(chu)的?(de)記??(ji)憶??(yi)B細??(xi)胞??(bao)可??(ke)在??(zai)免?(mian)疫??(yi)結(jié)??(jie)束??(shu)后??(hou)保??(bao)留??(liu)抗??(kang)體??(ti)“圖??(tu)譜??(pu)”??，實??(shi)現(xiàn)??(xian)快??(kuai)速??(su)二?(er)次??(ci)應(yīng)??(ying)答??(da)??。??。