这里(lǐ )需要说明的(de )是,在(zài )我们(men )系(xì )统里面如果(guǒ )单(dān )独设置一(yī )个子域(yù )名(míng )解析(xī ),比如将主机名设置(zhì )为(wéi )mail,单独解(jiě )析到9,那么(me )该解(jiě )析(xī )记录优先泛(fàn )域名在实(shí )际(jì )使(shǐ )用中作(zuò )用是非(fēi )常广泛(fàn )的,比如(rú )实现(xiàn )无限二(èr )级域名功能,提供(gòng )免费的url转发,在
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