这里需(xū )要说(shuō )明的是(shì ),在我们(men )系统里面如果单(dān )独设置一(yī )个(gè )子域名解析,比如将主机(jī )名设(shè )置(zhì )为mail,单(dān )独解析到(dào )9,那么(me )该解析记(jì )录(lù )优先(xiān )泛域名(míng )在实际使用(yòng )中作用(yòng )是非常广(guǎng )泛的(de ),比如实现无限(xiàn )二级(jí )域名(míng )功能(néng ),提(tí )供免费的url转发,在
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