这里需(xū )要(yào )说明(míng )的是,在(zài )我(wǒ )们系统里(lǐ )面(miàn )如果(guǒ )单独(dú )设置一(yī )个(gè )子域名(míng )解析,比如(rú )将(jiāng )主机名设置(zhì )为mail,单(dān )独(dú )解析(xī )到(dào )9,那么该解(jiě )析(xī )记录(lù )优先泛域名在实际使用中作用是非常广泛的,比(bǐ )如实现(xiàn )无限(xiàn )二级(jí )域(yù )名功能,提供(gòng )免费的url转发,在
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