Inside the classroom on a hot summer day these pupils are concentrating on their work.
一个炎日的夏天，这些小学生们正在课室里专心投入他们的学习。
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Others allow pupils to carry phones if they do not use them during the school day, but most expect electronic equipment to be deposited in lockers or put in zipped bags at the start of each lesson.
Consequently, animals with rectangular eyes can see better at night due to having larger pupils that can be closed more tightly during the day to restrict light.