这里(lǐ )需要说明的是,在(zài )我(wǒ )们(men )系统里面如果单独设置一个子域名解析(xī ),比如(rú )将主机(jī )名设(shè )置为(wéi )mail,单(dān )独解析到9,那么该(gāi )解析(xī )记(jì )录(lù )优先(xiān )泛域(yù )名在(zài )实(shí )际(jì )使用中(zhōng )作用是非常广(guǎng )泛的,比如(rú )实现无(wú )限二级域名功(gōng )能,提供免费的(de )url转发(fā ),在
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