The reason we categorize servers, and not clients, is because a client normally can't tell whether it's talking to an iterative server or a concurrent server.
我们归类服务而不归类客户端的原因是，客户端通常不能区别它是在和一个迭代服务器通信还是在和一个并发服务器通讯。
The name server checks its database and cache, doesn't find anything, and sends an iterative request to a root server for the .com top-level domain.
该名称服务器检查其数据库和缓存，没有找到任何结果，于是向.com 顶级域的根服务器发送一个迭代请求。
Among all queries sent to DNS, the proportion of iterative query is larger than 30%, so the performance of server selection algorithm directly affects the performance of a DNS server.
在DNS中的所有查询请求中，迭代查询所占的比例大于30%，因此服务器选择算法的性能对整个DNS服务器的整体性能有着非常大的影响。
Among all queries sent to DNS, the proportion of iterative query is larger than 30%, so the performance of server selection algorithm directly affects the performance of a DNS server.
在DNS中的所有查询请求中，迭代查询所占的比例大于30%，因此服务器选择算法的性能对整个DNS服务器的整体性能有着非常大的影响。
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