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　　先??(xian)天??(tian)性??(xing)免??(mian)疫??(yi)是??(shi)人??(ren)類??(lei)與?(yu)生??(sheng)俱??(ju)來??(lai)的??(de)防??(fang)御??(yu)系??(xi)統(tǒng)?(tong)??，如??(ru)同??(tong)城??(cheng)堡??(bao)的??(de)第??(di)一??(yi)道??(dao)城??(cheng)墻??(qiang)和?(he)巡??(xun)邏??(luo)衛(wèi)?(wei)兵??(bing)??，能??(neng)在??(zai)病??(bing)原??(yuan)體??(ti)入??(ru)侵??(qin)時??(shi)迅??(xun)速??(su)反??(fan)應(yīng)??(ying)?。??　　第??(di)二??(er)道??(dao)防??(fang)御??(yu)是??(shi)“清??(qing)道??(dao)夫??(fu)軍??(jun)團(tuán)??(tuan)”??，負(fù)??(fu)責(zé)??(ze)吞??(tun)噬??(shi)與??(yu)清??(qing)掃??(sao)??。??中??(zhong)性??(xing)粒??(li)細(xì)??(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(xì)??(xi)胞??(bao)如??(ru)同?(tong)“清??(qing)障??(zhang)車??(che)”??，負(fù)?(fu)責(zé)??(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(xì)??(xi)胞??(bao)參?(can)戰(zhàn)??(zhan)??。。