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First of all, the cost of obtaining customers on a large scale remains high. Although parents' awareness of online learning has improved significantly due to the market for online children's English, parents' trust in online learning still needs to be improved.According to Microsoft statistics, the upper limit of dynamic domain name queries that a DNS server can withstand is 9,000 requests per second. However, we know that tens of thousands of domain name resolution requests per second can be easily constructed on a P3 PC, which is enough to paralyze a DNS server with extremely high hardware configuration, thus showing the vulnerability of the DNS server. At present, the most commonly used DNS server software is the leading WINMYDNS in China and Bind abroad.Having said so much, summarize the application scenarios of the three adapter modes:　　黄克强和青梅竹马阿男（叶童 饰）两情相悦，无奈阿难的父亲却要将阿男嫁给她并不喜欢的富家子弟，黄克强和阿难决定私奔。然而，就当三人跃跃欲试之际，战争爆发了，出国的计划再次流产。之后，阿男惨遭巡警强暴，黄克强终于得到了阿男父亲的认可，而叶剑飞则成为了“日军太保”，至此，三人依然没有忘记当初的约定，他们登上了难民船，开始了他们最后的旅行。秦淼就脸红了，再也不提回去的事。老者见他不大，脸上浮现出惊疑的神sè。这个就是真玉米，自然不像之前那些兄弟姊妹，用怀疑的神色打量他，目光是亲切的，笑容是真诚的。