这里需要(yào )说(shuō )明的(de )是,在我们(men )系统里(lǐ )面如果单(dān )独设(shè )置(zhì )一(yī )个子域(yù )名解(jiě )析(xī ),比(bǐ )如将主机名(míng )设置为mail,单独解(jiě )析到(dào )9,那么该(gāi )解析(xī )记录优(yōu )先泛(fàn )域名在(zài )实际使用(yòng )中(zhōng )作用是非常广(guǎng )泛的,比(bǐ )如实现无限二级(jí )域名功能,提(tí )供免费的url转发,在
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