✋Article
A 2017 study at an English high school found that students who started school at 10 a.m. instead of 8:50 a.m. had better health and school results.
For the first year of the study, the students started school at 8:50 a.m. For the second and third years, their start time changed to 10 a.m. Then, for the fourth year, the students went back to starting at 8:50 a.m.
The researchers looked at how often students stayed home from school due to illness, and how well they did with their school work.
For the first year, the average number of absences due to illness was 15.4 per student. In the second year, that number dropped to 11.3, and by the third year it was just 7.9. But in the fourth year, when the students went back to starting at 8:50 a.m., the number went up to 11.2.
The students' school work also improved. By the end of the first year, only 34% of the students had a grade of C or higher in five or more of their GCSEs — General Certificate of Secondary Education subjects, which need to be taken by most students in the UK.
By the end of the second year, 53% of students had a C or higher in five or more of their GCSEs. The number went down to 52% in the third year, and 51% in the fourth year.
Professor Russell Foster, of Oxford University, says that teenagers need 9 hours of sleep, but many only get 5 hours on a school night.

✋Summary
2017年英國一所高中的一份研究發現，學生如果是在早上10點上學而不是8點50分的話，身體健康跟在校表現都會比較好。執行這份研究的第一年，學生們都在早上8點50分上學。 第二年和第三年的時候，上學時間改到早上10點。接著，第四年的時候學生又改回早上8點50分上學。 研究人員查看學生生病待在家的頻率高低，以及他們在學校的課業表現如何。 第一年的時候，每位學生因為生病而缺席的平均次數為15.4。 第二年的時候，這個數字降到11.3，第三年的時候則只有7.9。

✋Words & Phrases

• grade 分數
• absence 缺席
• professor 教授

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