输入埠在NVR系统之中无法控制，是因为他必须由所连接之装置或电路加以控制，例如开关、感应器等等。
Input ports cannot be controlled in the NVR system. They are connected to physical input devices such as switches, sensors... etc.
例如，- f开关通常用于告诉程序读取一个配置文件，这将因为该文件可能覆盖或者补充命令行上给出的选项而使处理变复杂。
For instance, the -f switch commonly used to tell a program to read a configuration file complicates the configuration because the file may override or supplement options given on the command line.
例如，在电视机的例子中，人们很少会在使用开关按钮时犯错误。
For example, people seldom make mistakes when turn on or turn off the TV set.
应用推荐