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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)?。??　　免??(mian)疫??(yi)系??(xi)統(tǒng)??(tong)如??(ru)同??(tong)人??(ren)體??(ti)的??(de)“智??(zhi)能??(neng)防??(fang)衛(wèi)??(wei)軍??(jun)”??，在??(zai)不??(bu)同??(tong)人??(ren)生??(sheng)階??(jie)段??(duan)需??(xu)要??(yao)差??(cha)異??(yi)化??(hua)的?(de)戰(zhàn)??(zhan)略??(lve)部??(bu)署??(shu)??。??現(xiàn)?(xian)代??(dai)醫(yī)??(yi)學(xué)??(xue)研??(yan)究??(jiu)發(fā)??(fa)現(xiàn)??(xian)??，0～3歲??(sui)兒??(er)童??(tong)免??(mian)疫??(yi)記??(ji)憶??(yi)形?(xing)成??(cheng)速??(su)度??(du)約??(yue)為??(wei)成??(cheng)人??(ren)的??(de)3倍??(bei)??，而??(er)60歲??(sui)后??(hou)胸??(xiong)腺??(xian)功??(gong)能??(neng)每??(mei)年??(nian)衰??(shuai)退??(tui)3%??。因??(yin)此??(ci)??，掌??(zhang)握??(wo)各??(ge)年??(nian)齡??(ling)段?(duan)的?(de)免??(mian)疫??(yi)維??(wei)護??(hu)密??(mi)碼??(ma)??，才??(cai)能??(neng)讓??(rang)這??(zhe)道??(dao)健??(jian)康?(kang)防??(fang)線?(xian)愈??(yu)加??(jia)堅??(jian)固??(gu)??。。