我登录了工作电脑,但系统宕机了。
I ___logged ___on to my work computer, but the system was down.
要访问课程材料,你必须登录大学门户网站。
To access the course materials, you must ___log ___in to the university portal.
员工在使用公司网络前必须登录。
Employees are required to ___log ___on before they can use the company network.