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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)秘(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)???！　∠??(xiang)要??(yao)免??(mian)疫??(yi)系??(xi)統(tǒng)??(tong)穩(wěn)??(wen)定??(ding)運(yùn)??(yun)行??(xing)??，總??(zong)的??(de)來(lái)??(lai)說(shuō)??(shuo)??，需??(xu)從??(cong)日??(ri)常??(chang)防??(fang)護(hù)?(hu)、生??(sheng)活??(huo)習(xí)??(xi)慣?(guan)到??(dao)健??(jian)康??(kang)監(jiān)??(jian)測(cè)??(ce)全??(quan)面??(mian)入??(ru)手??(shou)??。??。