三男一女吃奶添下面

　　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)??。??　　兒??(er)童??(tong)至??(zhi)青??(qing)少??(shao)年??(nian)期?(qi)(4～18歲??(sui))??，隨??(sui)著?(zhe)免??(mian)疫??(yi)系??(xi)統(tǒng)?(tong)逐??(zhu)漸??(jian)成??(cheng)熟??(shu)??，適??(shi)應?(ying)性??(xing)免??(mian)疫??(yi)(T細??(xi)胞??(bao)、B細??(xi)胞??(bao))開??(kai)始??(shi)發(fā)?(fa)揮??(hui)主??(zhu)力??(li)作??(zuo)用?(yong)??，能?(neng)針??(zhen)對??(dui)病??(bing)原??(yuan)體??(ti)產?(chan)生??(sheng)特??(te)異??(yi)性??(xing)抗??(kang)體?(ti)??。??但??(dan)免??(mian)疫?(yi)系??(xi)統(tǒng)??(tong)也??(ye)可??(ke)能??(neng)因??(yin)“經??(jing)驗??(yan)不??(bu)足??(zu)”而?(er)反??(fan)應??(ying)過??(guo)度??(du)??，如??(ru)對??(dui)花??(hua)粉??(fen)、食??(shi)物??(wu)等??(deng)無??(wu)害??(hai)物??(wu)質??(zhi)過??(guo)度??(du)反??(fan)應??(ying)??，引?(yin)發(fā)??(fa)哮??(xiao)喘??(chuan)、濕??(shi)疹??(zhen)；如??(ru)接??(jie)觸??(chu)外??(wai)界??(jie)增??(zeng)多??(duo)??，易??(yi)感??(gan)染??(ran)手??(shou)足??(zu)口??(kou)病??(bing)、水?(shui)痘??(dou)等?(deng)傳??(chuan)染??(ran)病??(bing)??。UBXZNXLMFTqibao666888　　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)??。??　　er ??(er)tong ??(tong)zhi ??(zhi)qing ??(qing)shao ??(shao)nian ??(nian)qi ?(qi)(4～18sui ??(sui))??，sui ??(sui)zhe ?(zhe)mian ??(mian)yi ??(yi)xi ??(xi)tong ?(tong)zhu ??(zhu)jian ??(jian)cheng ??(cheng)shu ??(shu)??，shi ??(shi)ying ?(ying)xing ??(xing)mian ??(mian)yi ??(yi)(Txi ??(xi)bao ??(bao)、Bxi ??(xi)bao ??(bao))kai ??(kai)shi ??(shi)fa ?(fa)hui ??(hui)zhu ??(zhu)li ??(li)zuo ??(zuo)yong ?(yong)??，neng ?(neng)zhen ??(zhen)dui ??(dui)bing ??(bing)yuan ??(yuan)ti ??(ti)chan ?(chan)sheng ??(sheng)te ??(te)yi ??(yi)xing ??(xing)kang ??(kang)ti ?(ti)??。??dan ??(dan)mian ??(mian)yi ?(yi)xi ??(xi)tong ??(tong)ye ??(ye)ke ??(ke)neng ??(neng)yin ??(yin)“jing ??(jing)yan ??(yan)bu ??(bu)zu ??(zu)”er ?(er)fan ??(fan)ying ??(ying)guo ??(guo)du ??(du)??，ru ??(ru)dui ??(dui)hua ??(hua)fen ??(fen)、shi ??(shi)wu ??(wu)deng ??(deng)wu ??(wu)hai ??(hai)wu ??(wu)zhi ??(zhi)guo ??(guo)du ??(du)fan ??(fan)ying ??(ying)??，yin ?(yin)fa ??(fa)xiao ??(xiao)chuan ??(chuan)、shi ??(shi)zhen ??(zhen)；ru ??(ru)jie ??(jie)chu ??(chu)wai ??(wai)jie ??(jie)zeng ??(zeng)duo ??(duo)??，yi ??(yi)gan ??(gan)ran ??(ran)shou ??(shou)zu ??(zu)kou ??(kou)bing ??(bing)、shui ?(shui)dou ??(dou)deng ?(deng)chuan ??(chuan)ran ??(ran)bing ??(bing)??。