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學習快評丨qibao666888　　其??(qi)次??(ci)是?(shi)清??(qing)除??(chu)威??(wei)脅??(xie)??，包?(bao)括??(kuo)消??(xiao)滅?(mie)細?(xi)菌??(jun)、病??(bing)毒??(du)等??(deng)外??(wai)來??(lai)入??(ru)侵??(qin)者??(zhe)??，及?(ji)時??(shi)發(fā)??(fa)現(xiàn)??(xian)并??(bing)清??(qing)除??(chu)異??(yi)常??(chang)細??(xi)胞?(bao)??，防??(fang)止??(zhi)腫??(zhong)瘤??(liu)形??(xing)成??(cheng)??。??　　先??(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)??，能祝(neng)在??(zai)病??(bing)原??(yuan)體??(ti)入??(ru)侵??(qin)時??(shi)迅??(xun)速??(su)反??(fan)應??(ying)??。??。