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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)??。　　成??(cheng)年??(nian)期??(qi)是??(shi)免??(mian)疫??(yi)系??(xi)統(tǒng)??(tong)的??(de)“黃??(huang)金??(jin)時??(shi)代??(dai)”??，功??(gong)能??(neng)趨??(qu)于??(yu)穩(wěn)??(wen)定??(ding)??，但??(dan)不??(bu)良??(liang)生??(sheng)活??(huo)習??(xi)慣?(guan)可??(ke)能??(neng)引?(yin)發(fā)??(fa)“隱??(yin)形??(xing)危??(wei)機??(ji)”??。??這??(zhe)一??(yi)時??(shi)期??(qi)的??(de)免??(mian)疫?(yi)特??(te)點??(dian)主??(zhu)要??(yao)是??(shi)兩??(liang)個??(ge)方?(fang)面??(mian)??，一??(yi)是?(shi)胸??(xiong)腺??(xian)萎??(wei)縮??(suo)??，新??(xin)生??(sheng)T細??(xi)胞??(bao)減?(jian)少??(shao)??，依??(yi)賴??(lai)記??(ji)憶??(yi)T細??(xi)胞?(bao)應??(ying)對??(dui)病??(bing)原??(yuan)體??(ti)；二??(er)是??(shi)慢?(man)性??(xing)炎??(yan)癥??(zheng)??，吸??(xi)煙??(yan)、肥??(fei)胖?(pang)、壓??(ya)力??(li)等?(deng)導??(dao)致??(zhi)低??(di)度??(du)炎??(yan)癥??(zheng)??，增??(zeng)加??(jia)糖??(tang)尿??(niao)病??(bing)、心??(xin)血??(xue)管??(guan)疾??(ji)病??(bing)風??(feng)險??(xian)??。。