这里需(xū )要说明的(de )是,在(zài )我(wǒ )们(men )系统里面(miàn )如(rú )果单(dān )独设置一个子(zǐ )域(yù )名解析,比如将主机(jī )名设(shè )置(zhì )为mail,单独解析到9,那(nà )么(me )该(gāi )解(jiě )析(xī )记录优先泛域名(míng )在实(shí )际使(shǐ )用中作用是非常广泛的,比(bǐ )如实现无(wú )限二级域(yù )名功能,提(tí )供(gòng )免费的url转发(fā ),在
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