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　　第?(di)三??(san)道??(dao)防?(fang)御??(yu)是??(shi)“生??(sheng)化??(hua)武??(wu)器??(qi)庫??(ku)”??，負??(fu)責??(ze)標?(biao)記??(ji)與??(yu)“圍??(wei)剿?(jiao)”??。??如??(ru)補??(bu)體??(ti)蛋?(dan)白?(bai)??，就??(jiu)像??(xiang)“熒??(ying)光??(guang)涂??(tu)料??(liao)”一??(yi)樣??(yang)標??(biao)記??(ji)病??(bing)原??(yuan)體??(ti)??，幫??(bang)助??(zhu)免??(mian)疫??(yi)細??(xi)胞?(bao)精??(jing)準??(zhun)識??(shi)別??(bie)目?(mu)標??(biao)；如??(ru)炎?(yan)癥??(zheng)反??(fan)應??(ying)??，局??(ju)部??(bu)紅??(hong)腫?(zhong)、發(fā)??(fa)熱??(re)??，既??(ji)是??(shi)戰(zhàn)??(zhan)斗??(dou)信??(xin)號??(hao)??，也??(ye)能??(neng)抑??(yi)制??(zhi)病?(bing)原?(yuan)體??(ti)繁??(fan)殖??(zhi)???！　∠??(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??(ying)??。??。