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　　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(shí)??(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(bào)??(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)???！　∶??(mian)疫??(yi)系??(xi)統(tǒng)?(tong)的??(de)發(fā)?(fa)育??(yu)如??(ru)同??(tong)建??(jian)造??(zao)一??(yi)座??(zuo)城?(cheng)堡??(bao)??，需??(xu)要?(yao)從?(cong)地??(di)基??(ji)開??(kai)始??(shi)逐??(zhu)步??(bu)完??(wan)善??(shan)??。??。