这(zhè )里需要说明(míng )的是,在我们系(xì )统里面如(rú )果单(dān )独(dú )设置一个子域(yù )名(míng )解(jiě )析,比如将(jiāng )主机(jī )名(míng )设置为(wéi )mail,单独解析到9,那么该解析记录优先泛域名(míng )在(zài )实际使(shǐ )用(yòng )中(zhōng )作用是(shì )非常(cháng )广(guǎng )泛的,比如(rú )实现无(wú )限二级域(yù )名功能,提(tí )供(gòng )免(miǎn )费(fèi )的url转发,在
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