这孩子课后被留在学校做额外作业。

The boy was detained at school to extra work.

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系所将规定其他额外作业。

Faculty will provide additional assignments.

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教师们表示，他们会在课程结束或放学后给予个别学生另外的辅导，必要时还会安排额外的作业。

Teachers say that they give individual help at the end of a lesson or after school, setting extra work if necessary.

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So, in terms of practicing this weekend, I mentioned that instead of getting a problem-set today, what I am going to be posting is optional extra problems.

而对于这周的练习，我曾经说过今天将不会布置作业，但是会布置一些额外的习题。

麻省理工公开课 - 化学原理课程节选