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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(lái)??(lai)入??(ru)侵??(qin)者??(zhe)??，及??(ji)時(shí)??(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)??。??　　免??(mian)疫??(yi)系??(xi)統(tǒng)??(tong)如??(ru)同?(tong)人??(ren)體??(ti)的??(de)“智??(zhi)能??(neng)防??(fang)衛(wèi)??(wei)軍??(jun)”?，在?(zai)不??(bu)同??(tong)人??(ren)生?(sheng)階??(jie)段??(duan)需??(xu)要??(yao)差??(cha)異??(yi)化??(hua)的??(de)戰(zhàn)??(zhan)略?(lve)部??(bu)署??(shu)??。??現(xiàn)??(xian)代??(dai)醫(yī)??(yi)學(xué)??(xue)研??(yan)究??(jiu)發(fā)?(fa)現(xiàn)??(xian)?，0～3歲??(sui)兒??(er)童??(tong)免??(mian)疫??(yi)記??(ji)憶??(yi)形??(xing)成??(cheng)速??(su)度??(du)約??(yue)為??(wei)成??(cheng)人??(ren)的?(de)3倍??(bei)?，而??(er)60歲??(sui)后??(hou)胸??(xiong)腺??(xian)功??(gong)能??(neng)每?(mei)年??(nian)衰??(shuai)退??(tui)3%??。因??(yin)此??(ci)?，掌??(zhang)握?(wo)各??(ge)年??(nian)齡??(ling)段??(duan)的??(de)免??(mian)疫??(yi)維??(wei)護(hù)??(hu)密??(mi)碼?(ma)?，才??(cai)能??(neng)讓??(rang)這??(zhe)道??(dao)健??(jian)康??(kang)防??(fang)線??(xian)愈??(yu)加?(jia)堅(jiān)??(jian)固??(gu)??。。