这里需要(yào )说明(míng )的(de )是(shì ),在(zài )我们系(xì )统里面如果(guǒ )单独(dú )设置一个(gè )子域名解析,比如将主机(jī )名(míng )设置(zhì )为mail,单独(dú )解析到9,那么该解析(xī )记录优(yōu )先泛(fàn )域(yù )名在实际使(shǐ )用中(zhōng )作用是非(fēi )常(cháng )广泛的,比如(rú )实现无(wú )限(xiàn )二(èr )级域(yù )名功(gōng )能,提供免费的url转发(fā ),在
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