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随着中学教材改革的深入,许多原来只在大学教材中才出现的一些概念现在已经出现在中学教材中.但是,由于中学教材的难度的限制,很多概念和
With the deepening of reform in teaching materials in middle schools, many of the concepts that originally appeared only in college textbooks now appear in secondary school textbooks.But due to the difficulty of high school textbooks, many concepts and