especially during summer vacation
特别是在暑假期间
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Some experts say lengthening the school year is more important, because there is ample evidence that some students, especially those who are low-income, suffer setbacks in their learning from being out of school during the long summer vacation.
WSJ: School in August Gets Low Grades
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