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原標題：国产国语对白露脸正在播放

　　嬰??(ying)幼??(you)兒??(er)期?(qi)(0～3歲??(sui))??，新??(xin)生??(sheng)兒??(er)免??(mian)疫??(yi)系??(xi)統(tǒng)?(tong)像??(xiang)一??(yi)支??(zhi)未??(wei)經??(jing)實??(shi)戰(zhàn)??(zhan)的??(de)“新??(xin)兵??(bing)部??(bu)隊??(dui)”??，先??(xian)天??(tian)性?(xing)免??(mian)疫??(yi)(如??(ru)中??(zhong)性??(xing)粒??(li)細??(xi)胞??(bao)、巨??(ju)噬??(shi)細??(xi)胞??(bao))活??(huo)性??(xing)高??(gao)??，但?(dan)皮??(pi)膚?(fu)、黏??(nian)膜?(mo)屏??(ping)障??(zhang)薄??(bo)弱??(ruo)??，易??(yi)受?(shou)病??(bing)毒??(du)(如??(ru)呼??(hu)吸??(xi)道??(dao)合??(he)胞??(bao)病??(bing)毒??(du)、輪??(lun)狀??(zhuang)病?(bing)毒??(du))侵??(qin)襲??(xi)?。??此??(ci)時?(shi)主??(zhu)要??(yao)依??(yi)賴?(lai)母??(mu)體??(ti)通??(tong)過??(guo)胎?(tai)盤??(pan)和??(he)母??(mu)乳??(ru)傳??(chuan)遞??(di)的??(de)抗??(kang)體??(ti)(如??(ru)IgG、IgA)提??(ti)供??(gong)保??(bao)護?(hu)?。　　第?(di)二??(er)道??(dao)防?(fang)御??(yu)是??(shi)“清??(qing)道??(dao)夫??(fu)軍??(jun)團??(tuan)”??，負??(fu)責??(ze)吞??(tun)噬??(shi)與??(yu)清??(qing)掃??(sao)??。??中??(zhong)性??(xing)粒??(li)細??(xi)胞?(bao)24小??(xiao)時??(shi)在??(zai)血??(xue)液??(ye)中??(zhong)“巡??(xun)邏??(luo)”??，一??(yi)旦??(dan)發(fā)??(fa)現(xiàn)??(xian)病??(bing)原??(yuan)體??(ti)??，立??(li)刻??(ke)沖??(chong)鋒??(feng)吞??(tun)噬??(shi)??。巨??(ju)噬??(shi)細??(xi)胞??(bao)如??(ru)同??(tong)“清??(qing)障??(zhang)車??(che)”??，負??(fu)責??(ze)吞??(tun)噬??(shi)病??(bing)原?(yuan)體??(ti)并??(bing)發(fā)??(fa)出?(chu)警??(jing)報??(bao)信??(xin)號??(hao)??，召??(zhao)集??(ji)其??(qi)他??(ta)免?(mian)疫??(yi)細??(xi)胞??(bao)參??(can)戰(zhàn)??(zhan)??。。