请在会议开始前签到。

Please sign in before the meeting starts.

学生每天早上都要签到。

Students have to sign in every morning.

进入系统前，请先签到。

Please sign in before accessing the system.

他忘记了签到，所以没有记录。

He forgot to sign in, so there is no record.

你需要在前台签到。

You need to sign in at the front desk.

协议要求所有参与者在进入前签到。

The protocal requires all participants to sign in before entering.

如果考勤机坏了，我们就需要手动签到。

If the attendance machine breaks down, we will need to sign in manually.

每个学生回到学校都必须签到.

Every student must sign in when he comes back to the college.

签到和ASP。净表单验证，我怎么退出?。

Google+ sign in and ASP. NET forms authentication, how do I sign out?

每个女生回到宿舍的时候都必须签到。

Every girl must sign in when she comes back to the dormitory.