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　　第??(di)二??(er)道??(dao)防??(fang)御??(yu)是??(shi)“清??(qing)道??(dao)夫??(fu)軍??(jun)團??(tuan)”??，負??(fu)責??(ze)吞??(tun)噬??(shi)與??(yu)清?(qing)掃??(sao)??。??中??(zhong)性?(xing)粒??(li)細??(xi)胞??(bao)24小?(xiao)時??(shi)在??(zai)血??(xue)液??(ye)中??(zhong)“巡??(xun)邏??(luo)”??，一??(yi)旦??(dan)發(fā)??(fa)現(xiàn)??(xian)病??(bing)原??(yuan)體??(ti)??，立??(li)刻??(ke)沖??(chong)鋒??(feng)吞??(tun)噬??(shi)??。巨??(ju)噬??(shi)細??(xi)胞??(bao)如??(ru)同??(tong)“清??(qing)障??(zhang)車??(che)”??，負??(fu)責??(ze)吞??(tun)噬??(shi)病??(bing)原?(yuan)體??(ti)并??(bing)發(fā)??(fa)出??(chu)警??(jing)報?(bao)信??(xin)號?(hao)??，召??(zhao)集??(ji)其??(qi)他??(ta)免??(mian)疫??(yi)細??(xi)胞??(bao)參??(can)戰(zhàn)??(zhan)??。　　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?(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??(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??(jian)固??(gu)??。。