The client sends a recursive query to its primary name server.
客户端向其主名称服务器发送递归查询。
Non-recursive queries allow the server to return a partial response, such as returning the name or address of the server that may know the answer (or may have more information).
非递归查询允许服务器返回部分响应，例如返回可能知道答案(或可能具有更多信息)的服务器的名称或地址。
This service is optional in a name server, and the name server may also choose to restrict the clients which can use recursive mode.
这种递归查询的模式对于名称服务器而言是可选的，并且名称服务器可以设置禁止客户端使用递归查询模式。
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