If instead we wanted to register an arbitrary subroutine (defined using sub method_name{ ... }), we would have to register a reference to this subroutine like so: -command=>\&method_name.

如果不采用这种方法的话，我们要想注册一个子例程（用 sub method_name{ ... } 来定义），那么必须注册一个到这个子例程的引用，类似于： -command=>\&method_name 。

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Including the main program, sub-control robot moves, voice and speech recognition to play subroutine program.

其中包括主程序、机器人动作控制子程序、语音播放子程序及语音识别程序。

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