这(zhè )里需(xū )要说明的是(shì ),在(zài )我(wǒ )们系统里面如果单(dān )独(dú )设(shè )置一(yī )个子域名(míng )解析,比如(rú )将(jiāng )主(zhǔ )机(jī )名(míng )设(shè )置为mail,单独解析到9,那么该解析记录(lù )优先泛域(yù )名在实际使用(yòng )中(zhōng )作用是非常广泛(fàn )的,比如(rú )实现无(wú )限(xiàn )二级域名功(gōng )能,提供免费的url转(zhuǎn )发(fā ),在
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