说明：  主程序是一个用户登录程序，可以登录添加和删除用户。子程序是一个温度监控程序，温度超过一定范围就会自动停止。根据主程序中不同的用户登录，子程序中用户的权限也不一样。
(The main program is a user login process, you can log in to add and delete users. A subroutine is a temperature monitoring program, the temperature exceeds a certain range will automatically stop. According to different users log in the main program, subroutines in the user' s permissions are not the same.)