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　　其??(qi)次??(ci)是??(shi)清??(qing)除??(chu)威??(wei)脅??(xie)??，包??(bao)括??(kuo)消??(xiao)滅??(mie)細(xì)??(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(xì)?(xi)胞?(bao)??，防??(fang)止??(zhi)腫??(zhong)瘤??(liu)形??(xing)成??(cheng)??。??　　第??(di)一??(yi)道??(dao)防??(fang)御??(yu)是??(shi)物??(wu)理?(li)屏??(ping)障??(zhang)??，比?(bi)如??(ru)皮??(pi)膚??(fu)和??(he)黏??(nian)膜??(mo)??，像??(xiang)城??(cheng)墻??(qiang)一??(yi)樣??(yang)覆??(fu)蓋??(gai)體??(ti)表?(biao)??，通??(tong)過??(guo)汗??(han)液??(ye)、皮??(pi)脂?(zhi)和??(he)黏??(nian)液??(ye)中??(zhong)的??(de)抗??(kang)菌??(jun)成??(cheng)分??(fen)??，直??(zhi)接??(jie)阻??(zu)擋??(dang)細(xì)??(xi)菌??(jun)、病??(bing)毒??(du)入?(ru)侵??(qin)；比??(bi)如??(ru)呼??(hu)吸??(xi)道??(dao)纖??(xian)毛?(mao)??，如??(ru)同??(tong)護??(hu)城??(cheng)河??(he)的??(de)“清??(qing)道??(dao)夫??(fu)”??，通??(tong)過??(guo)擺??(bai)動??(dong)??，將??(jiang)灰??(hui)塵??(chen)和??(he)病??(bing)原??(yuan)體??(ti)排??(pai)出?(chu)體??(ti)外??(wai)??。??。