这里(lǐ )需(xū )要说(shuō )明的(de )是,在我们(men )系统里(lǐ )面(miàn )如果单(dān )独(dú )设(shè )置(zhì )一个子域名解析,比如将主(zhǔ )机(jī )名设(shè )置(zhì )为mail,单(dān )独解(jiě )析到9,那(nà )么该解(jiě )析(xī )记录(lù )优(yōu )先(xiān )泛(fàn )域名在实际使(shǐ )用中作用是非(fēi )常广(guǎng )泛的,比如实现无限二级域名功能(néng ),提供免费的url转发,在
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