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That may explain the paradox that, after primary school, there seems little or no relationship between class size and educational achievement.

这似乎可以用来解释一个悖论：小学过后，班级大小与教育成果之间几乎没有什么联系了。

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Nevertheless, the U.S. was often near the top of the class in global tests of academic achievement.

FORBES: Can Online Tutoring Reverse America's Academic Decline?

Ofsted has been campaigning for schools to make more use of whole-class teaching, whose neglect it regards as one of the reasons for under-achievement in other subjects.

ECONOMIST: School curriculum