一项全球教育成就调查显示，全世界在数学和科学方面最聪明的青少年是新加坡的。
The world's smartest adolescence in mathematics and science are Singapore, according to a global survery of educational achievement.
根据我们所做的一项调查，我们学校的大多数学生每天花大约六个小时在屏幕上。
According to a survey we did, most students in our school spend about six hours a day on screens.
根据最近发布的一项针对数学、科学和阅读水平的国际调查，上海青少年的教育水平居全球之首。
Teenagers from the city of Shanghai have the best education in the world, according to a major international study of standards in maths, science and literacy released recently.
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