这里(lǐ )需(xū )要说(shuō )明的(de )是,在(zài )我们系统里面如果(guǒ )单独设置一(yī )个(gè )子域(yù )名解(jiě )析,比如将主机名设置为mail,单独解析到9,那么该解(jiě )析(xī )记录优(yōu )先泛域(yù )名(míng )在实际使(shǐ )用中作用(yòng )是非(fēi )常广泛的,比如实现(xiàn )无限(xiàn )二(èr )级(jí )域(yù )名功能,提供(gòng )免(miǎn )费的url转(zhuǎn )发,在
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