这里需要(yào )说明(míng )的是,在(zài )我(wǒ )们系统(tǒng )里(lǐ )面如果(guǒ )单(dān )独设置一(yī )个子域名(míng )解析(xī ),比如(rú )将主机名设(shè )置(zhì )为(wéi )mail,单(dān )独解(jiě )析(xī )到9,那么该解析记录(lù )优先泛域名在(zài )实际使(shǐ )用(yòng )中(zhōng )作用是(shì )非常广泛的,比如实(shí )现无限二级(jí )域名功能,提供免费的url转(zhuǎn )发(fā ),在
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