这里需(xū )要(yào )说明的(de )是,在我们系统里面如(rú )果(guǒ )单(dān )独设置一个(gè )子(zǐ )域名解析,比(bǐ )如(rú )将主机(jī )名设置为mail,单独(dú )解(jiě )析到9,那么(me )该解析(xī )记(jì )录(lù )优先泛域名(míng )在(zài )实际使用(yòng )中作用是非(fēi )常广泛(fàn )的(de ),比如(rú )实现无限二级域(yù )名功能,提(tí )供免(miǎn )费的url转发(fā ),在(zài )
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