Fewer than 20 students passed all the exams.

不到20个学生考试全部及格。

《牛津词典》

She had no more than 20 students in any class, for 100 minutes every day.

而她自己的班里，平均就只有20多个人左右，每个班级都能保证有100分钟以上的上课时间。

youdao

However, at last, Jiang Chunyang gained a place for his son by sponsoring the flight tickets of 20 students and 5 teachers.

最后，姜春阳居然以赞助20个学生和5位带队教师往返机票的方式，为姜浩争取到一个宝贵的名额。

youdao

"After 20 years of working with students, we are seeing unprecedented levels of engagement and creativity like we have not seen in 20 years,"

VOA: standard.2009.12.08

How are we helping students to think about those questions and what they really want. And I think that I recently gathered 20 students, 20 seniors, to really just talk about that.

我们该怎样帮助学生思考那些问题,思考他们真正想要什么，而且我认为,我最近召集了20个学生，20个大四学生，让他们认真谈谈这个问题。

普林斯顿公开课 - 人性课程节选

And it was limited to 20 students to make sure

当时课上限制只能有20个人，这是为了确保

选择国际学的理由 - SpeakingMax英语口语达人