If a computer user fails to log off, the system is accessible to all.

如果一位电脑用户没有登出，所有人都可以进入该系统。

《柯林斯英汉双解大词典》

To complete client Setup, go to the client computer and log on. If the client computer is already logged on, log off and then log on again.

要完成客户端安装，请登录客户端计算机。如果客户端计算机已经登录，请注销然后再登录。

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It's time to leave the office for the night. Firstly I log off my computer, then I set the electronic security system.

是时间离开办公室了，首先我得注销我得电脑，然后我设置电子安全系统。

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