The study is based on observing and studying tens of thousands of children in over 100 schools in around 25 countries over the last ten years.
该项研究的研究人员在过去的十年里，对约25个国家的100多所学校中的数万个孩子进行了观察和研究。
The study is based on observing and studying tens of thousands of children in over 100 schools in around 25 countries over the last ten years.
该项研究的研究人员在过去的十年里，对约25个国家的100多所学校中的数万个孩子进行了观察和研究。
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