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並前往https://www.brookings.edu/research/summer-learning-loss-what-is-it-and-what-can-we-do-about-it/

Summer learning loss: What is it, and what can we do about it?

... summer vacation by one month's worth of school-year learning, (2) ... 2-9 from a southern state (from 2008-2012) found that students, ...

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