这里需要说明(míng )的是,在(zài )我们系统里(lǐ )面如果(guǒ )单(dān )独设置一个子(zǐ )域名解(jiě )析(xī ),比(bǐ )如将(jiāng )主机名设置为mail,单(dān )独(dú )解析(xī )到9,那(nà )么该解析记录优(yōu )先(xiān )泛域(yù )名(míng )在(zài )实(shí )际使(shǐ )用中作用是非(fēi )常广泛的,比如(rú )实现无限二级域(yù )名功能,提供(gòng )免费的url转(zhuǎn )发,在
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