translation.en: You've seen Finland doing so well on PISA, but what makes Finland so impressive is that only five percent of the performance variation amongst students lies between schools.
translation.zh: 你以看到芬兰在PISA中做的挺好， 但芬兰给人留下深刻印象的是 只有5%的学生的表现 在这些学校当中有变化。