七年级后的那个夏天，学生们要在大学校园里待上三周，每天学习七个小时的高等数学。
The summer after 7th grade, students spend three weeks on a college campus studying advanced math for seven hours a day.
七年级后的那个夏天，学生们要在大学校园里待上三周，每天学习七个小时的高等数学。
The summer after 7th grade, students spend three weeks on a college campus studying advanced math for seven hours a day.
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