这里(lǐ )需(xū )要说明(míng )的是(shì ),在我们(men )系统里面如果单独设(shè )置一(yī )个子域(yù )名解析,比(bǐ )如将(jiāng )主机名设置(zhì )为mail,单独(dú )解(jiě )析(xī )到9,那么该解(jiě )析(xī )记录优先泛域(yù )名在(zài )实际(jì )使用中作用是非常广(guǎng )泛(fàn )的,比如(rú )实现无限(xiàn )二级域(yù )名功能,提供(gòng )免费的(de )url转(zhuǎn )发,在
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