这(zhè )里(lǐ )需(xū )要(yào )说明的是,在(zài )我(wǒ )们(men )系(xì )统里面如果单独设置一(yī )个子域(yù )名解析(xī ),比(bǐ )如(rú )将主机(jī )名设置为(wéi )mail,单独解(jiě )析到9,那么(me )该解(jiě )析记录优先泛域名在实际使用(yòng )中作用是非常广泛的,比如实(shí )现无(wú )限二(èr )级域(yù )名功(gōng )能,提(tí )供免(miǎn )费的url转(zhuǎn )发,在
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