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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)黏秘(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(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??(guo)擺??(bai)動??(dong)?，將??(jiang)灰??(hui)塵??(chen)和??(he)病??(bing)原??(yuan)體??(ti)排??(pai)出秘(chu)體??(ti)外??(wai)??。??　　60歲??(sui)以??(yi)上?(shang)?，延??(yan)緩??(huan)衰?(shuai)退??(tui)?，守??(shou)護(hù)??(hu)免??(mian)疫??(yi)防??(fang)線??(xian)??。??。