这里需(xū )要(yào )说明的是(shì ),在我们(men )系统(tǒng )里面(miàn )如果(guǒ )单独(dú )设(shè )置一(yī )个(gè )子域(yù )名解析(xī ),比(bǐ )如将主机名设置为mail,单(dān )独解析到9,那么该解析(xī )记录(lù )优先泛(fàn )域(yù )名(míng )在实际使(shǐ )用(yòng )中作用是非常(cháng )广泛的(de ),比如(rú )实(shí )现无限二级域(yù )名功能,提(tí )供免费的url转发,在
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