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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)??。??YDHVNRIAKLqibao666888　　di ??(di)yi ??(yi)dao ??(dao)fang ??(fang)yu ??(yu)shi ??(shi)wu ??(wu)li ?(li)ping ?(ping)zhang ??(zhang)??，bi ?(bi)ru ??(ru)pi ??(pi)fu ??(fu)he ?(he)nian ??(nian)mo ??(mo)??，xiang ??(xiang)cheng ?(cheng)qiang ??(qiang)yi ??(yi)yang ??(yang)fu ??(fu)gai ??(gai)ti ??(ti)biao ??(biao)??，tong ??(tong)guo ??(guo)han ??(han)ye ??(ye)、pi ??(pi)zhi ??(zhi)he ?(he)nian ??(nian)ye ??(ye)zhong ??(zhong)de ??(de)kang ??(kang)jun ??(jun)cheng ??(cheng)fen ?(fen)??，zhi ??(zhi)jie ??(jie)zu ??(zu)dang ??(dang)xi ??(xi)jun ?(jun)、bing ??(bing)du ??(du)ru ??(ru)qin ??(qin)；bi ??(bi)ru ??(ru)hu ??(hu)xi ??(xi)dao ?(dao)xian ??(xian)mao ??(mao)??，ru ??(ru)tong ??(tong)hu ??(hu)cheng ??(cheng)he ??(he)de ??(de)“qing ??(qing)dao ??(dao)fu ??(fu)”??，tong ??(tong)guo ??(guo)bai ??(bai)dong ??(dong)??，jiang ??(jiang)hui ??(hui)chen ?(chen)he ??(he)bing ??(bing)yuan ??(yuan)ti ??(ti)pai ??(pai)chu ??(chu)ti ??(ti)wai ??(wai)??。??