这个单实例对象是根用户管理对象，启动和停止所有其他管理任务。
This singleton is the root management object that starts and stops all other management tasks.
秘书回复所有的日常电话，还要对文件进行归档整理，并处理其他管理任务。
A secretary not only answers all the routine telephone inquires but also maintains a filing system and handles other administrative duties.
Ubuntu在普及sudo上做了不少工作，强迫而非鼓励用户使用su转换到root帐号安装软件和执行其他管理任务。
Ubuntu has done a lot to popularize sudo by enforcing its use in place of encouraging users to use su to switch to the root account to install software and perform other administrative tasks.
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