Now I study 20 hours each week and sometimes I have an extra lesson.

现在我每周学20个小时的英语，有时候还会更多。

youdao

He is really nice to me and sometimes give me an extra lesson at spare time.

他对我很友善，有空的时候还给我开小灶上课。

youdao

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

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。

youdao

She said the slowness of the equipment made teachers question if it it is "actually worth planning a lesson and using these kind of facilities due to the extra problems that it will throw up".

BBC: Caroline Bowker

Better still, battery life didn't seem to take a hit even with the extra performance, though high-end, high-res gaming was still a lesson in futility when working without a discrete graphics card.

ENGADGET: Intel's Arrandale and Clarkdale CPUs get benchmarked for your enjoyment