这(zhè )里(lǐ )需要说明的是(shì ),在我们系统里面如果单独设置一(yī )个(gè )子域(yù )名(míng )解析(xī ),比如将(jiāng )主机名设置(zhì )为mail,单(dān )独解析到9,那么(me )该解析记录(lù )优先(xiān )泛域(yù )名在实际使(shǐ )用(yòng )中(zhōng )作用(yòng )是(shì )非(fēi )常(cháng )广泛的,比(bǐ )如实(shí )现无限(xiàn )二级域名功能,提(tí )供免费的(de )url转发(fā ),在(zài )
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