During login, a host may perform a reverse lookup on the IP address of the source address on the packets it receives.
在登录期间，主机可能会对它收到的数据包的源地址的IP地址执行反向查找。
Depending on the configuration of that host, it can take some time for the lookup to fail and the login to continue.
根据主机的配置不同，查找失败会花费一定的时间，然后继续登录。
The example also shows the use of the -n switch, which prints numeric host addresses, thereby avoiding name lookup and resolution and speeding up the trace.
这个示例还演示-n选项的用途，它输出数字的主机地址，从而避免名称查询和解析，可以提高跟踪速度。
If you're familiar with socket programming, you might be looking for gethostbyname and other such calls, which are used to perform the host-lookup function.
如果熟悉套接字编程，那么您可能会寻找gethostbyname和其他类似的调用，这些调用都可以用来执行主机查找功能。
A host record for the server, also known as an a resource record, is registered in a forward lookup zone in the DNS database.
服务器的主机记录(也称为A资源记录)在DNS数据库的正向查找区域中注册。
The host can be either a domain name or an IP address, as we all should know the domain name will resolve to an IP address (via a DNS lookup) to identify the machine we're trying to access.
主机地址可以是域名或IP地址，正如我所们所知的，域名会解析成ip地址(通过DNS查找)以确定我们正在尝试访问的机器的地址。
The host can be either a domain name or an IP address, as we all should know the domain name will resolve to an IP address (via a DNS lookup) to identify the machine we're trying to access.
主机地址可以是域名或IP地址，正如我所们所知的，域名会解析成ip地址(通过DNS查找)以确定我们正在尝试访问的机器的地址。
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