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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(hào)??(hao)??，召??(zhao)集??(ji)其??(qi)他??(ta)免??(mian)疫??(yi)細(xì)??(xi)胞??(bao)參??(can)戰(zhàn)??(zhan)??。　　T細(xì)??(xi)胞??(bao)的??(de)角??(jiao)色??(se)則??(ze)是??(shi)指?(zhi)揮??(hui)、“殺?(sha)敵??(di)”與??(yu)“維??(wei)穩(wěn)??(wen)”?。??比??(bi)如??(ru)輔??(fu)助??(zhu)T細(xì)??(xi)胞?(bao)??，扮??(ban)演??(yan)著??(zhe)“指??(zhi)揮??(hui)官??(guan)”角??(jiao)色??(se)??，通?(tong)過(guò)??(guo)釋??(shi)放??(fang)細(xì)?(xi)胞??(bao)因??(yin)子??(zi)??，激??(ji)活??(huo)B細(xì)?(xi)胞?(bao)和?(he)其??(qi)他??(ta)免??(mian)疫?(yi)細(xì)??(xi)胞??(bao)；細(xì)??(xi)胞??(bao)毒??(du)性??(xing)T細(xì)??(xi)胞??(bao)??，扮??(ban)演??(yan)著??(zhe)“殺??(sha)手??(shou)”角??(jiao)色?(se)??，直??(zhi)接??(jie)穿??(chuan)透?(tou)感??(gan)染?(ran)細(xì)??(xi)胞??(bao)??，注?(zhu)入?(ru)毒?(du)素??(su)將??(jiang)其??(qi)摧??(cui)毀??(hui)；調(diào)??(tiao)節(jié)??(jie)T細(xì)??(xi)胞??(bao)??，扮??(ban)演??(yan)著??(zhe)“維??(wei)穩(wěn)?(wen)員??(yuan)”角??(jiao)色??(se)??，防??(fang)止??(zhi)免??(mian)疫??(yi)反??(fan)應(yīng)??(ying)過(guò)?(guo)度??(du)??，避??(bi)免??(mian)誤??(wu)傷??(shang)健??(jian)康??(kang)組??(zu)織??(zhi)?。。