这(zhè )里需(xū )要说明(míng )的(de )是,在我们(men )系(xì )统里(lǐ )面如(rú )果单独(dú )设置一个(gè )子域名(míng )解析(xī ),比如将主机(jī )名设(shè )置(zhì )为mail,单独(dú )解析到(dào )9,那(nà )么该(gāi )解析记录优先泛域(yù )名(míng )在实际使(shǐ )用(yòng )中作(zuò )用是非常(cháng )广泛的,比如实(shí )现无(wú )限二级域(yù )名功能(néng ),提(tí )供免费的url转发,在
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