这(zhè )里需要(yào )说明的(de )是(shì ),在我们系统里(lǐ )面如果单独(dú )设(shè )置一(yī )个(gè )子域名解析,比如将主机(jī )名设置为mail,单(dān )独解(jiě )析到9,那(nà )么该解(jiě )析(xī )记录优先泛(fàn )域名在(zài )实际使用中(zhōng )作用(yòng )是非常(cháng )广泛(fàn )的,比如实现(xiàn )无限(xiàn )二级域名功(gōng )能(néng ),提(tí )供(gòng )免费的url转(zhuǎn )发,在
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