这里需要说(shuō )明的是,在我们系统里(lǐ )面(miàn )如(rú )果单独(dú )设(shè )置一个(gè )子域(yù )名解析,比如将(jiāng )主机名(míng )设置(zhì )为mail,单独(dú )解(jiě )析到9,那么该解析(xī )记录优(yōu )先(xiān )泛域(yù )名在实(shí )际使用(yòng )中作用是非常广(guǎng )泛的(de ),比如实现无(wú )限(xiàn )二(èr )级域(yù )名功能,提(tí )供免(miǎn )费的url转发(fā ),在
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