系统更新时，我们都被要求退出登录。

We were all asked to ___log ___off while the system was being updated.

许多学生只是退出登录而不关机。

Many students just ___log ___off without shutting down the computer.

在公共电脑上记得注销账户。

Remember to ___log ___out of your account on public computers.