这里需(xū )要说明的是,在我们系(xì )统里面(miàn )如(rú )果单(dān )独设(shè )置一个子域(yù )名解(jiě )析,比如(rú )将主(zhǔ )机名设置为mail,单(dān )独解析到9,那么该解析记(jì )录优先(xiān )泛域(yù )名(míng )在实(shí )际(jì )使(shǐ )用(yòng )中作用是非常(cháng )广(guǎng )泛的,比(bǐ )如(rú )实现无限(xiàn )二(èr )级域(yù )名(míng )功(gōng )能,提(tí )供免费的url转(zhuǎn )发,在
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