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　　在??(zai)人??(ren)類??(lei)演??(yan)化??(hua)的??(de)長??(chang)河??(he)中??(zhong)??，人??(ren)體??(ti)免??(mian)疫?(yi)系??(xi)統(tǒng)??(tong)猶??(you)如??(ru)一??(yi)座??(zuo)精??(jing)密??(mi)設(shè)??(she)計(jì)??(ji)的??(de)防??(fang)御??(yu)工??(gong)事??(shi)??，其??(qi)運(yùn)??(yun)作??(zuo)機(jī)??(ji)制??(zhi)既??(ji)展??(zhan)現(xiàn)??(xian)著??(zhe)生??(sheng)命??(ming)演?(yan)化??(hua)的??(de)智?(zhi)慧??(hui)??，也??(ye)蘊(yùn)??(yun)含??(han)著??(zhe)醫(yī)??(yi)學(xué)??(xue)干??(gan)預(yù)??(yu)的?(de)啟??(qi)示??(shi)??。??猶??(you)如??(ru)一??(yi)個(gè)??(ge)“隱??(yin)形??(xing)盾??(dun)牌??(pai)”??，免??(mian)疫??(yi)防??(fang)御??(yu)遵??(zun)從??(cong)怎??(zen)樣??(yang)的??(de)層?(ceng)次??(ci)？??不??(bu)同??(tong)年??(nian)齡??(ling)的??(de)免??(mian)疫??(yi)特??(te)點(diǎn)??(dian)有??(you)哪??(na)些??(xie)？人??(ren)體??(ti)免??(mian)疫??(yi)平??(ping)衡??(heng)的??(de)本??(ben)質(zhì)??(zhi)又??(you)是??(shi)什??(shen)么??(me)？來??(lai)看??(kan)看?(kan)它??(ta)的??(de)運(yùn)??(yun)作?(zuo)奧??(ao)秘??(mi)???！　〕??(cheng)年??(nian)期??(qi)是??(shi)免??(mian)疫??(yi)系??(xi)統(tǒng)??(tong)的??(de)“黃?(huang)金??(jin)時(shí)??(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(xí)??(xi)慣??(guan)可??(ke)能??(neng)引??(yin)發(fā)??(fa)“隱??(yin)形?(xing)危??(wei)機(jī)?(ji)”??。??這??(zhe)一??(yi)時(shí)??(shi)期?(qi)的??(de)免?(mian)疫??(yi)特?(te)點(diǎn)??(dian)主?(zhu)要??(yao)是??(shi)兩??(liang)個(gè)??(ge)方??(fang)面??(mian)??，一??(yi)是??(shi)胸??(xiong)腺?(xian)萎??(wei)縮??(suo)??，新??(xin)生?(sheng)T細(xì)??(xi)胞??(bao)減??(jian)少??(shao)??，依??(yi)賴??(lai)記??(ji)憶??(yi)T細(xì)??(xi)胞??(bao)應(yīng)??(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(dǎo)?(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(fēng)??(feng)險(xiǎn)??(xian)??。。