required space character

例句：

1. 1. It is required thatall students attend the meeting.
   所有学生都必须参加会议。
2. 2. The teacher required us to finish thework before class.
   老师要求我们在课前完成作业。
3. 3. Failure to meet the requirementswill result in disqualification.
   未达到要求将导致取消资格。