这(zhè )里需要说(shuō )明的是(shì ),在我们系(xì )统里(lǐ )面(miàn )如(rú )果单独设置(zhì )一个子(zǐ )域名(míng )解(jiě )析,比如将主机(jī )名设置为(wéi )mail,单独解析(xī )到9,那么该(gāi )解析记(jì )录(lù )优先泛(fàn )域名在实际(jì )使(shǐ )用中(zhōng )作用(yòng )是(shì )非(fēi )常广泛的,比(bǐ )如实现无限二(èr )级域名功能,提供免费的url转发(fā ),在
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