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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(lái)??(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(shí)?(shi)迅??(xun)速??(su)反??(fan)應(yīng)??(ying)??。??　　人??(ren)體??(ti)由??(you)兩??(liang)支??(zhi)精??(jing)銳??(rui)部??(bu)隊(duì)??(dui)——先??(xian)天??(tian)性??(xing)免??(mian)疫??(yi)和??(he)適??(shi)應(yīng)??(ying)性??(xing)免??(mian)疫??(yi)組?(zu)成??(cheng)??。??它??(ta)們??(men)分??(fen)工??(gong)明??(ming)確??(que)、協(xié)??(xie)同?(tong)作?(zuo)戰(zhàn)??(zhan)??，既??(ji)能??(neng)抵??(di)御??(yu)外??(wai)敵??(di)入??(ru)侵??(qin)??，又?(you)能??(neng)清??(qing)理?(li)內(nèi)??(nei)部??(bu)隱??(yin)患??(huan)??。。