这里需要(yào )说明(míng )的是,在(zài )我们(men )系统里面如(rú )果(guǒ )单独设置一个子(zǐ )域名解析(xī ),比如将(jiāng )主机(jī )名(míng )设(shè )置(zhì )为mail,单独解析(xī )到9,那(nà )么该解析记(jì )录优先泛(fàn )域名在实(shí )际(jì )使用(yòng )中作用是非常(cháng )广(guǎng )泛(fàn )的,比如实现(xiàn )无限二(èr )级域(yù )名功能,提供免费的url转发,在
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