translation.en: And ever since those results came out, policymakers, educators, researchers from around the world have tried to figure out what's behind the success of those systems.
translation.zh: 自从这些结果出现后， 来自世界各地的决策者，教育家，研究人员 都在试图搞清楚 这些教育系统成功的背后是什么。