n选项指定不应该执行主机名到ip地址解析。
The -n switch specifies that host name-to-IP address resolution shouldn't be performed.
单片机执行主机控制指令，控制无线接收单元，处理速度检测单元信号。
Microcomputer executes the instruction from the host, controls the radio receiver unit and deals with the signal from the velocity test unit.
这个文件告诉服务器如何执行主机名解析，这与Solaris服务器上nsswitch . conf文件的作用很相似。
This file tells the server how to perform host name resolution, much like how the nsswitch.conf file works on Solaris servers.
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