这(zhè )里需要说明的是(shì ),在我们(men )系统里面如果单(dān )独(dú )设置一(yī )个子(zǐ )域名解析,比如(rú )将主机名设置(zhì )为(wéi )mail,单独解析到9,那么(me )该解析(xī )记录优先泛域(yù )名在实际使(shǐ )用(yòng )中(zhōng )作用是非(fēi )常广(guǎng )泛的,比如(rú )实现无限(xiàn )二(èr )级(jí )域(yù )名(míng )功(gōng )能,提供(gòng )免(miǎn )费的url转发(fā ),在
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