这里(lǐ )需要(yào )说明(míng )的是(shì ),在(zài )我们系统里(lǐ )面(miàn )如果单独设置(zhì )一个(gè )子域名解析,比如将主机名(míng )设置(zhì )为mail,单独解(jiě )析(xī )到(dào )9,那(nà )么该解(jiě )析(xī )记(jì )录优(yōu )先(xiān )泛(fàn )域名在实(shí )际使用(yòng )中作用是非常广泛(fàn )的,比如实现无限二级(jí )域名(míng )功能,提(tí )供免费的url转发,在
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