This task could be handled by just looking up the field information as needed for the actual command line arguments, but I've instead made a choice to separate the lookup from the usage.
这项任务可以通过只查找实际的命令行参数所需的字段信息来处理，但是我反而选择将查找和使用分开。
3
One method to determine whether DNS is in fact working is to use the name server lookup, or nslookup, command.
确定DNS实际是否在工作的一种方法是使用name server lookup或nslookup命令。