这里需(xū )要说(shuō )明的(de )是(shì ),在我们(men )系(xì )统里面如果(guǒ )单独设(shè )置一个子域(yù )名(míng )解析(xī ),比如(rú )将(jiāng )主机名设(shè )置为mail,单独(dú )解析到9,那么该解析记(jì )录优先泛域名在实(shí )际(jì )使用中(zhōng )作(zuò )用是(shì )非常广(guǎng )泛的,比如实现无限(xiàn )二级域名功(gōng )能(néng ),提供(gòng )免(miǎn )费的url转发(fā ),在(zài )
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