Middle school is an important age because students have enough math capability to solve advanced problems, but they haven't really decided what they want to do with their lives.
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20 - 21《Cognition in Practice： Mind, Mathematics, and Culture in Everyday Life》在实践中认知：心智、数学和日常生活的文化是关于这个观点的一本有趣的参考书。
(p. 20-21) the book Cognition in Practice: Mind, Mathematics, and Culture in Everyday Life is an interesting reference for this viewpoint.
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